Patton electronic Network Card 1140ARC User Manual

Dear Valued Customer,  
Thank you for purchasing Patton Electronics products! We do  
appreciate your business. I trust that you find this user manual helpful.  
We manufacture one of the widest selections of data  
communications products in the world including CSU/DSU's, network  
termination units, powered and self-powered short range modems, fiber optic  
modems, interface converters, baluns, electronic data switches, data-line surge  
protectors, multiplexers, transceivers, hubs, print servers and much more. We  
produce these products at our Gaithersburg, MD, USA, facility, and can  
custom manufacture products for your unique needs.  
USER  
MANUAL  
MODEL 1140ARC  
We would like to hear from you. Please contact us in any of the  
following ways to tell us how you like this product and how we can meet your  
product needs today and in the future.  
RS-232 Fiber Optic  
Rack Card Modem  
w/ V.54 & V.52 Diagnostics  
Web:  
(301) 975-1000  
(301) 975-1007  
(301) 869-9293  
Sales E-mail:  
Support E-mail:  
Phone - Sales  
Phone - Support  
Fax:  
Mail:  
Patton Electronics Company  
7622 Rickenbacker Drive  
Gaithersburg, MD 20879 USA  
We are committed to a quality product at a quality price. Patton  
Electronics is BABT and ISO 9001 certified. We meet and exceed the highest  
standards in the industry (CE, UL, etc.).  
It is our business to serve you. If you are not satisfied with any  
aspect of this product or the service provided from Patton Electronics or its  
distributors, please let us know.  
Thank you.  
Burton A.Patton  
Vice President  
P.S. Please tell us where you purchased this product.  
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Part #07M1140ARC-A  
Doc #018032UA  
Revised 3/16/98  
SALES OFFICE  
(301) 975-1000  
TECHNICAL SUPPORT  
(301) 975-1007  
An ISO-9001  
Certified Company  
 
2.0 GENERAL INFORMATION  
3.0 CONFIGURATION  
Thank you for your purchase of this Patton Electronics product.  
This product has been thoroughly inspected and tested and is  
warranted for One Year parts and labor. If any questions or problems  
arise during installation or use of this product, please do not hesitate to  
contact Patton Electronics Technical Support at (301) 975-1007,  
This section describes the location and orientation of the Model  
1140ARC’s configuration switches and jumpers, and provides detailed  
instructions for all possible settings.  
The Model 1140ARC uses a combination of DIP switches and  
jumpers that allow configuration to an extremely wide range of  
applications. Designed around a mid-plane architecture, the Model  
1140ARC incorporates both front and rear cards. Configuration of both  
may be necessary. The switches/jumpers are accessible when the  
cards are removed from the rack chassis. Once configured, the Model  
1140ARC is designed to operate transparently, without need for  
frequent re-configuration.  
2.1 FEATURES  
• Supports async or sync communication over dual optical fibers  
• RS-232 Data rates to 57.6 Kbps  
• Distances to 4 miles  
V.54 and V.52 Diagnostics  
3.1 FRONT CARD CONFIGURATION  
• Mounts in Patton’s 16-Card Rack Chassis  
• Compatible with the Patton Model 1140A self-powered modem  
• Immune to RFI/EMI noise, ground loops and transient surges  
• Easily accessible configuration jumpers & switches  
• Bi-level LED status indicators  
The Model 1140ARC front card has two sets of eight switches (S1 &  
S2), which are mounted on the PC board (Figure 1, below). These  
configuration switches allow you to configure the Model 1140ARC for a  
wide range of applications. The ON/OFF orientation of the DIP  
switches is shown in figure 2 (below).  
• Works with switchable 120V or 240V rack mount power supply  
• SMA or ST connectors available (HD-26 female RS-232 port) on  
rear Interface card  
SwitchSet 2  
(Switch 2:1 on bottom)  
2.2 DESCRIPTION  
Switch Set 1  
(Switch 1:1 on bottom)  
The Patton Model 1140ARC fiber optic rack card modem is the  
rack mountable counterpart to Patton’s Model 1140A self-powered, fiber  
optic modem. Communicating full or half duplex over dual optical  
fibers, the Model 1140ARC supports data rates to 57.6 Kbps and  
distances to 4 miles. Both V.54 and V.52 diagnostics are built into the  
unit. Like all fiber optic modems, the Model 1140ARC is inherently  
immune to RFI/EMI noise, ground loops and transient surges. The  
carrier may be switch selected as either “Continuously On” or  
“Controlled by RTS”. Five pairs of bi-level LED indicators monitor TD,  
RD, RTS, CD, test and error. A single LED monitors power.  
Figure 1. Model 1140ARC front card jumper locations  
ON  
The Model 1140ARC is designed to mount in Patton’s 2U high 19”  
rack chassis. This 16-card chassis has a switchable 120/240 volt  
power supply and mounts cards in a mid-plane architecture: The front  
“brains” half-card can be plugged into different rear “interface” cards.  
The Model 1140ARC is available with a choice of two interface cards:  
one with SMA connectors, and one with ST connectors. Both cards are  
equipped with an HD-26 female connector for the RS-232 interface.  
OFF  
Figure 2. Close-up of DIP switches showing “ON” and “OFF” positions  
3
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3.1.1 CONFIGURATION SWITCH SET “S1”  
S1-5 and S1-6: Clock Source  
The DIP switches on S1 set data rate, clock source, async./sync.  
mode and carrier control method. The default settings are summarized  
in the table below. Following the table is a description of all possible S-  
1 switch settings.  
Switches S1-5 and S1-6 are set in combination to determine the  
transmit clock source for the Model 1140ARC.  
S1-5  
On  
Off  
S1-6  
On  
On  
Setting  
Internal transmit clock  
Receive recover clock  
External transmit clock  
S1 SUMMARY TABLE  
On  
Off  
Position  
S1-1  
S1-2  
S1-3  
S1-4  
S1-5  
S1-6  
S1-7  
S1-8  
Function  
Data Rate  
Factory Default  
On  
Off  
S1-7: Asynchronous/Synchronous Mode  
Data Rate  
9,600 bps  
Data Rate  
Off  
On  
On  
On  
On  
}
}
The setting for switch S1-7 determines whether the Model  
1140ARC is in asynchronous or synchronous operating mode.  
Data Rate  
Clock Source  
Clock Source  
Async./Sync.  
Carrier Control  
Internal  
Async.  
S1-7  
On  
Off  
Setting  
Asynchronous  
Synchronous  
Off Constantly On  
S1-8: Carrier Control Method  
S1-1 through S1-4: Data Rate Setting  
The setting for switch S1-8 determines whether the carrier is  
“constantly on” or “controlled by RTS”. This setting allows for operation  
in switched carrier, multipoint and/or hardware handshaking  
applications.  
Switches S1-1 through S1-4 are set in combination to determine  
the asynchronous and synchronous data rate for the Model 1140ARC.  
S1-1  
On  
Off  
On  
Off  
On  
Off  
On  
Off  
On  
Off  
On  
Off  
S1-2  
On  
On  
Off  
Off  
On  
On  
Off  
Off  
On  
On  
On  
On  
S1-3  
On  
On  
On  
On  
Off  
Off  
Off  
Off  
On  
On  
Off  
Off  
S1-4  
On  
On  
On  
On  
On  
On  
On  
On  
Off  
Off  
Off  
Off  
Setting  
S1-8  
Off  
On  
Setting  
Constantly On  
Switched Carrier  
1.2 Kbps  
1.8 Kbps  
2.4 Kbps  
3.6 Kbps  
4.8 Kbps  
7.2 Kbps  
9.6 Kbps  
14.4 Kbps  
19.2 Kbps  
28.8 Kbps  
38.4 Kbps  
57.6 Kbps  
5
6
 
3.1.2 CONFIGURATION SWITCH SET “S2”  
S2-4 and S2-5: RTS/CTS Delay  
The DIP switches on S2 set word length, extended signaling rate,  
RTS/CTS delay and V.52 and V.54 diagnostic test. The default settings  
are summarized in the table below. Following the table is a description  
of all possible S-2 switch settings.  
The combined settings for switches S2-4 and S2-5 determine the  
amount of delay between the time the Model 1140ARC “sees” RTS and  
when it sends CTS. Options are no delay, 7 ms and 53 ms.  
S2-4  
On  
S2-5  
On  
Setting  
7 mS  
S2 SUMMARY TABLE  
Off  
On  
Off  
On  
Off  
Off  
53 mS  
No delay  
No delay  
Position  
S2-1  
S2-2  
S2-3  
S2-4  
S2-5  
S2-6  
S2-7  
S2-8  
Function  
Word Length  
Factory Default  
Off  
10 bits  
}
Word Length  
Off  
S2-8: V.54 Loopback Test Enable  
Extended Signaling Rate  
RTS/CTS Delay  
RTS/CTS Delay  
Future Use  
Off-2.5% to +2.3%  
On  
To reset the V.54 circuit, set switch S2-6 to the “ON” position, then  
back to the “OFF” position..  
7 mS  
}
On  
-
-
S2-8  
Off  
On  
Setting  
V.54 Enable  
V.54 Disable  
Future Use  
V.52/V.54 Tests  
Off  
Enable  
3.2 REAR CARD CONFIGURATION  
S2-1 and S2-2: Word Length  
The Model 1140ARC is compatible with two dual-fiber interface  
cards, one with dual ST connectors and one with dual SMA connectors.  
Both cards use an HD-26 female for the RS-232 interface. The single  
configuration jumper (JB1) functions identically on both cards. Figure 3  
(below) shows the jumper’s location.  
Switches S2-1 and S2-2 are set in combination to determine the  
word length for asynchronous data.  
S2-1  
Off  
S2-2  
On  
Setting  
8 bits  
On  
On  
9 bits  
Off  
On  
Off  
Off  
10 bits  
11 bits  
S2-3: Extended Signaling Rate  
JB1  
(pin 1 on right)  
The setting for switch S2-3 determines the range of variability the  
Model 1140ARC “looks for” in asynchronous data rates (i.e., the actual  
variance from a given frequency level the Model 1140ARC will tolerate).  
S2-3  
Off  
On  
Setting  
-2.5% to +1%  
-2.5% to +2.3%  
Basic  
Extended  
3 2 1  
Figure 3. Model 1140ARC rear card jumper location  
7
8
 
4.0 INSTALLATION  
3.2.1 HOW THE JUMPER WORKS  
This section describes the functions of the Model 1000R16 rack  
chassis, tells how to install front and rear Model 1140ARC cards into  
the chassis, and provides instructions for connecting the interface  
cables.  
Figure 4 (below) shows the 3-pin jumpers used on the rear card.  
The strap enables or disables a particular function depending upon  
whether it straddles pins 1 and 2, or pins 2 and 3.  
4.1 THE MODEL 1000R16 RACK CHASSIS  
The 1000R16 Rack Chassis (Figure 5, below) has sixteen short  
range modem card slots, plus its own power supply. Measuring only  
3.5” high, the 1000R16 is designed to occupy only 2U in a 19” rack.  
Sturdy front handles allow the 1000R16 to be extracted and transported  
conveniently.  
Figure 4. Orientation of interface card strap  
DTE Shield (Pin 1) & FRGND (JB1)  
In the connected (closed) position, this strap links DB-25 pin 1 and  
frame ground. In the open (disconnected) position, pin 1 is “lifted” from  
frame ground.  
JB1  
Figure 5. Model 1000R16 rack chassis with power supply  
Position 1&2 = DTE Shield (Pin 1) and FRGND connected  
Position 2&3 = DTE Shield (Pin 1) and FRGND not connected  
4.1.1 THE RACK POWER SUPPLY  
The power supply included in the Model 1000R16 rack uses the  
same mid-plane architecture as the modem cards. The front card of  
the power supply slides in from the front, and the rear card slides in  
from the rear. They plug into one another in the middle of the rack.  
The front card is then secured by thumb screws and the rear card by  
conventional metal screws.  
WARNING! There are no user-serviceable parts in the power  
supply section of the Model 1140ARC. Voltage setting changes  
and fuse replacement should only be performed by qualified  
service personnel. Contact Patton Electronics Technical  
[email protected] for more information.  
10  
9
 
Switching the Power Supply On and Off  
4.3 WIRING UP THE MODEL 1140ARC  
Both of the rear interface cards compatible with the Model  
1140ARC have one RS-232 port and one dual-connector fiber port (see  
Figure 6. below). Depending upon the card you have, the fiber port will  
be either an ST or SMA connector. The RS-232 port is always a female  
HD-26 connector.  
The power supply on/off switch is located on the front panel. When  
plugged in and switched on, a red front panel LED will glow. Since the  
Model 1000R16 is a “hot swappable” rack, it is not necessary for any  
cards to be installed before switching on the power supply. The power  
supply may be switched off at any time without harming the installed  
cards.  
Dual SMA  
Dual ST  
NOTE: Please refer to the Model 1000RP Series User Manual AC  
and DC Rack Mount Power Supplies for fuse and power card  
replacement information.  
4.2 INSTALLING THE MODEL 1140ARC INTO THE CHASSIS  
The Model 1140ARC is comprised of a front card and a rear card.  
The two cards meet inside the rack chassis and plug into each other via  
mating 50 pin card edge connectors. Use the following steps as a  
guideline for installing each Model 1140ARC into the Model 1000R16  
rack chassis:  
HD-26 F  
HD-26 F  
1. Slide the rear card into the back of the chassis along the metal  
rails.  
Figure 6. Model 1140ARC interface card options  
2. Secure the rear card using the metal screws provided.  
4.3.1 RS-232 CONNECTION  
3. Slide the front card into the front of the chassis. It should meet the  
rear card when it’s almost all the way into the chassis.  
The RS-232 port on the rear card of the Model 1140ARC is wired  
as a DCE, and uses a female HD-26 connector. The HD-26 is an  
alternate connector according to the EIA RS-232E specification, and  
the pin-out is the same as a standard DB-25. Pin 26 is not used.  
4. Push the front card gently into the card-edge receptacle of the rear  
card. It should “click” into place.  
5. Secure the front card using the thumb screws.  
You will need an interface cable to connect the Model 1140ARC to  
your RS-232 device. Assuming your RS-232 device is a DTE (PC,  
host, terminal, workstation, etc.), the cable should be wired straight  
through . You may either provide your own cable, or you may purchase  
an HD-26 to DB-25 cable from Patton Electronics Company. Please  
call the Patton Sales Department at (301) 975-1000 for price and  
delivery information.  
NOTE: Since the Model 1000R16 chassis allows “hot swapping”  
of cards, it is not necessary to power down the rack when you  
install or remove a Model 1140ARC.  
Notice! Any terminal cable connected to the Model 1140ARC  
must be shielded cable, and the outer shield must be 360  
degree bonded–at both ends–to a metal or metalized backshell.  
11  
12  
 
5.0 OPERATION  
4.3.2 FIBER CONNECTIONS  
Once you have configured each Model 1140ARC and connected the  
cables, you are ready to operate the units. This section describes the  
LED status monitors and power-up procedure.  
The Model 1140ARC is designed to work with the self-powered  
Model 1140A, or with another Model 1140ARC. In either case, you will  
need one unit at each end of a dual fiber cable. This cable connects to  
the Model 1140ARC using either ST or SMA connectors. Figure 7  
(below) shows a close-up of each of these connector types.  
5.1 LED STATUS MONITORS  
The Model 1140ARC features ten front panel status LEDs that  
indicate the condition of the modem and communication link:  
The green “PWR” LED glows when power is applied to the modem  
card through its mid-plane chassis connection.  
The green “TD” and “RD” indicators blink to show positive state  
data activity. The Red “TD” and “RD” indicators blink to show  
negative state data activity. Solid red indicates an idle state.  
The green “RTS” and “CD” indicators glow solid to show the control  
signal is on. The red “RTS” and “CD” indicators glow solid to show  
the control signal is off. When the 1140ARC is connected to a  
DTE, RTS will glow green for an incoming signal on RS-232 pin 4.  
CD will glow green for an incoming signal from the line, and an  
outgoing signal on RS-232 pin 8.  
alignment pin  
faces down  
Figure 7. Close up of ST and SMA connections  
The “Test” LED glows when either the Local Analog Loopback  
(LAL) or Remote Digital Loopback (RDL) V.54 test mode is  
initiated. The “Error” LED blinks when an error is detected by the  
V.52 diagnostics.  
5.2 POWER-UP  
There is no power switch on the Model 1140ARC: Power is  
automatically applied to the 1140ARC when its card-edge connector  
makes contact with the chassis’ mid-plane socket, or when the chassis’  
power supply is turned on. Note: The 1140ARC is a “hot swappable”  
card—it will not be damaged by plugging it in or removing it while the  
rack is powered up.  
When the local and remote units are both powered up, and are  
passing data normally, the following LED conditions will exist:  
• PWR = green  
• TD & RD = flashing red and green  
• RTS & CD = green  
Test = off  
• Error = off  
13  
14  
 
5.3.2 REMOTE DIGITAL LOOPBACK (RDL)  
5.3 TEST MODES  
The Model 1140ARC offers two V.54 test modes and two V.52 test  
modes to evaluate the condition of the modems and the communication  
link. Both sets of tests can be activated physically from the front panel.  
The V.54 test can also be activated from the RS-232 interface. Note:  
V.54 and V.52 test modes on the Model 1140ARC are available for  
point-to-point applications only.  
The Remote Digital Loopback (RDL) test checks the performance of  
both the local and remote Model 1140ARCs, and the communication  
link between them. Any characters sent to the remote 1140ARC in this  
test mode will be returned back to the originating device. For example,  
characters typed on the keyboard of the local terminal will appear on  
the local terminal screen after having been passed to the remote Model  
1140ARC and looped back. To perform an RDL test, follow these  
steps:  
5.3.1 LOCAL ANALOG LOOPBACK (LAL)  
The Local Analog Loopback (LAL) test checks the operation of the  
local Model 1140ARC, and is performed separately on each unit. Any  
data sent to the local Model 1140ARC in this test mode will be echoed  
(returned) back to the user device. For example, characters typed on  
the keyboard of a terminal will appear on the terminal screen. To  
perform a LAL test, follow these steps:  
1. Activate RDL. This may be done in two ways: First, by  
moving the upper front panel toggle switch LEFT to “Remote”.  
Second, by raising pin 21 on the RS-232 interface. (Note: be  
sure DIP switch S2-8 is off).  
2. Verify that the DTE equipment on the local end is operating  
properly and can be used for a test.  
1. Activate LAL. This may be done in one of two ways: First, by  
moving the upper front panel toggle switch RIGHT to “Analog”.  
Second, by raising pin 18 on the RS-232 interface (note: be  
sure DIP switch S2-8 is off). Once LAL is activated, the Model  
1140ARC transmit output is connected to its own receiver.  
The “Test” LED should be lit.  
3. Locate the lower of the two toggle switches on the front panel  
of the 1140ARC and move it to the right. This will activate the  
V.52 BER test mode and inject a “511” test pattern into the  
remote loop. If any errors are present in the loop, the red  
“Error” LED will blink sporadically.  
2. Verify that the data terminal equipment is operating properly  
and can be used for a test.  
4. If the BER test indicates no errors are present, move the V.52  
toggle switch to the left, thus activating the “511/E” test with  
periodic errors. If the test is working properly, the red “Error”  
LED will light. A successful “511/E” test will confirm that the  
loop is in place, and that the Model 1140ARC’s built-in “511”  
generator and detector are working properly.  
3. Locate the lower of the two toggle switches on the front panel  
of the Model 1140ARC and move it to the right. This will  
activate the V.52 BER test mode and inject a “511” test pattern  
into the local loop. If any errors are present in the loop, the  
red “Error” LED will blink sporadically.  
5. If the remote BER test indicates that errors are present, and  
the local analog loopback/BER tests showed that both Model  
1140ARCs were functioning properly, this suggests a problem  
with the twisted pair communication line connecting the two  
modems. A common problem is improper crossing of the  
pairs. Also, verify that the modular connections are pinned  
properly, and the twisted pair line has continuity. If you still  
have errors, call Technical Support at (301) 975-1007.  
4. If the BER test indicates no errors are present, move the V.52  
toggle switch to the left, thus activating the “511/E” test with  
periodic errors. If the test is working properly, the red “Error”  
LED will light. A successful “511/E” test will confirm that the  
loop is in place, and that the Model 1140ARC’s built-in “511”  
generator and detector are working properly.  
5. If the BER test indicates that errors are present, check to see  
that the RS-232 cable connecting the DTE to the Model  
1140ARC is wired straight through, and is plugged in properly.  
Also, ensure that the Model 1140ARC is configured properly.  
Then re-check your DTE equipment. If you still have errors,  
call Patton Technical Support at (301) 975-1007.  
15  
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APPENDIX A  
5.3.3 USING THE V.52 BER TEST INDEPENDENTLY  
PATTON MODEL 1140ARC SPECIFICATIONS  
The Model 1140ARC's V.52 BER test can be used independent of  
the V.54 loopback tests. This requires two operators: one to initiate and  
monitor the test at both the local and the remote Model 1140ARC. To  
use the V.52 BER test by itself, both operators should simultaneously  
follow these steps:  
Transmission Line: Dual optical cable  
Transmission Mode: Asynchronous, half or full duplex, point-to-point  
Interfaces: EIA RS-232, CCITT V.24  
1. Locate the lower of the two toggle switches on the front panel  
of the Model 1140ARC and move it to the right. This will  
activate the V.52 BER test mode and transmit a “511” test  
pattern to the other unit. If any errors are present, the  
receiving modem’s red “Error” LED will blink sporadically.  
Note: For this independent test to function, the “511” switch on  
both Model 1140ARCs must be turned on.  
Data Rates: 0 - 57.6 Kbps  
Distance: 4 miles over continuous fiber  
RTS/CTS Delay: Switch-selectable: No delay, 7.0 mS, 53 mS  
Receiver Sensitivity: -45 dBm  
2. If the test indicates no errors are present, move the V.52  
toggle switch to the left, thus activating the “511/E” test with  
periodic errors present. If the test is working properly, the  
receiving modem’s red “Error” LED will blink regularly. A  
successful “511/E” test will confirm that the link is in place, and  
that the Model 1140ARC’s built-in “511” generator and detector  
are working properly.  
Coupled Power Output: -20 to -25 dBm  
Optic Wavelength: 850 nm  
LED Indicators: Power, TD, RD, RTS, CD, Test Mode, Error  
Connectors: HD-26 female on RS-232 side; ST or SMA connectors  
on fiber side  
Power Supply: 120/240V (switchable) on rack chassis  
Temperature Range: 0-60°C (32-140°F)  
Altitude: 0-15,000 feet  
Humidity: Up to 95% non-condensing  
Weight: 2 oz.  
Dimensions: 0.95”W x 3.1”H x 5.4”L  
17  
18  
 
APPENDIX B  
APPENDIX C  
PATTON MODEL 1140ARC PIN CONFIGURATIONS  
PATTON MODEL 1140ARC FACTORY REPLACEMENT PARTS  
UNIVERSAL D-26 INTERFACE (DCE WIRING)  
The Patton Model 1140ARC rack system features interchangeable  
rear half cards, power cords/fuses for international various operating  
environments and other user-replaceable parts. Model numbers and  
descriptions for these parts are listed below:  
Patton Model #  
Description  
Digital Loop (RDL) - 21  
Data Terminal Ready (DTR) - 20  
8 - (CD) Carrier Detect  
7 - (SG) Signal Ground  
6 - (DSR) Data Set Ready  
5 - (CTS) Clear to Send  
4 - (RTS) Request to Send  
3 - (RD) Receive Data  
2 - (TD) Transmit Data  
1 - (FG) Frame Ground  
1000RPEM..........................120/240V Rear Power Entry Module  
1000RPSM-2.......................120/240V Front Power Supply Module  
1000RPEM-DC ...................DC Rear Power Entry Module  
1000RPSM-48A..................48V Front Power Supply Module  
1000RPEM-V ......................120/240V CE Compliant Rear Power  
Entry Module  
Analog Loop (LAL) - 18  
Receiver Clock (RC - 17  
Transmitter Clock (TC) - 15  
1000RPSM-V ......................120/240V CE Compliant Front Power  
Supply Module  
0805US ...............................American Power Cord  
0805EUR.............................European Power Cord CEE 7  
0805UK...............................United Kingdom Power Cord  
0805AUS.............................Australia/New Zealand Power Cord  
0805DEN.............................Denmark Power Cord  
0805FR ...............................France/Belgium Power Cord  
0805IN.................................India Power Cord  
0805IS.................................Israel Power Cord  
0805JAP..............................Japan Power Cord  
0805SW ..............................Switzerland Power Cord  
05R16FPB1.........................Single Width Blank Front Panel  
05R16FPB4.........................4-Wide Blank Front Panel  
05R16RPB1 ........................Single Width Blank Rear Panel  
05R16RPB4 ........................4-Wide Blank Rear Panel  
0821R4................................400 mA Fuse (5x20mm)  
Littlefuse 239.400 or equivalent  
0821R2................................200 mA Fuse (5x20mm)  
Littlefuse 239.200 or equivalent  
056S1..................................Set of 16 #4 pan head screws/washers  
19  
20  
 
APPENDIX D  
BLOCK DIAGRAM  
Copyright © 1998  
Patton Electronics Company  
All Rights Reserved  
21  
 

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