Modems
MOT202T
“Born-Again”
UDS/Motorola 202T
Introducing the latest addition to the Telenetics®
family of industrial grade, temperature hardened
modems, the MOT202T is a pin-for-pin, form, fit
and function replacement for the Motorola/UDS
Model RM16M202T.
▲ 2-wire half duplex or 4-wire full duplex
private line operation
▲ 0 to 1200 bps data rate over unconditional
lines and 1800 over high quality lines
▲ Anti-streaming
A must for industrial applications, the MOT202T
(Standalone) features built-in diagnostic, anti-
streaming, multi-power inputs (115 to 240AC, 12 to
125VDC) and -40ºC to +80ºC operating range capabilities.
▲ Phase coherent, frequency shift keyed
(FSK) modulation
▲ LED indicators
The modem operates over leased or dedicated, loaded
or unloaded lines equal to or better than the ITU
(formerly CCITT) M.1020/1025 or the BELL 3002 leased
line services. It operates over point-to-point or
multi-point polled systems and operates in full or
half-duplex over 4-wire or 2-wire circuits.
▲ Front panel rotary switch function selector
▲ Integral test features
▲ 12, 24, 48, 125VDC Power (Rack)
▲ 115VAC, 60Hz - 220/240VAC 50 Hz
power (Standalone)
The modem employs circuitry to prevent data and carrier detect errors over noisy lines. In multi-drop systems
it is very common to have noise spikes and other harmful high frequency components caused by carrier turn-offs
from other modems on the same line. The modem uses a combination of soft-carrier generation and soft-carrier
detection in conjunction with a signal to noise ratio (SNR) detector to eliminate errors caused by line noise.
The MOT202T’s anti-streaming capability prevents a modem from remaining in the transmit mode when the modem is
not actively transmitting date. In addition, the MOT202T allows users to verify transmitted and received data
via the diagnostic feature.
The MOT202T interchangeable design between the Universal Data Shelf multiple modem enclosure (RM16M series)
and the standalone modem enclosure, enables the modem to be directly inserted in the Universal Data Shelf when
the optional front panel is attached. Thus, data-communications facility can easily upgrade from front
multiple standalone enclosures to a centralized rack without the expense and trouble of purchasing new modems.
Power edge
connector
A 12-pin edge connector located at the
left side of the modem board. This
connector supplies the modem board with
power from the standalone case or the
modem rack. Header H1 is located on top
of P1.
Digital Data edge P2 is a 25-pin edge connector located at
connector
the backend of the modem board. The eleven
signals routed to and from this connector
are the RS 232 data interface signals.
Pin RS 232 V.24
Function
circuit
circuit
1
2
3
4
5
6
7
8
AA
BA
BB
CA
CB
CC
AB
CF
101
103
104
105
106
107
102
109
----
----
----
Protective Ground
Transmitted Data
Received Data
Request To Send
Clear To Send
Data Set Ready
Signal Ground
Data Carrier Detect
+ 12 Volt.Test only
- 12 Volt.Test only
Analog Loop back
Pin Voltage Function
Header H1 Pin
10
12
8
+ 15 VDC
- 15 VDC
Transformer 20 VAC
Transformer 20 VAC
2
1
Center Tap Transformer center tap 3 & 4
4
6
+ 8.5 VDC Transformer 10 VAC
+ 8.5 VDC Transformer 10 VAC
6
5
2
GND
Chassis Ground
n.c.
9
10
25
----
----
----
Modem Board Selective Jumper Options
Operational Settings
Modem Timing
Data Carrier Detect Level
RTS/CTS Delay
- 30 dBm
- 45 dBm
8 ms
33 ms
59 ms
219 ms
Transmit Level
0 dBm
- 2 dBm
Data Carrier Detect Delay
- 4 dBm
6 ms
- 6 dBm
23 ms
- 8 dBm
Turnaround Squelch Time
83 ms
159.6 ms
- 10 dBm
- 12 dBm
- 14 dBm
Soft Carrier Timing
No Soft Carrier
8.3 ms
Line Connection
2- wire
4- wire
26.6 ms
Turnaround Squelch
In
Out
Anti-Streaming Time
4 ms
7.6 ms
14 ms
28 ms
56 ms
Out
Transmit Carrier
RTS Control
Constant Carrier
Local Copy Squelch
No Local Copy
Local Copy
Test Generator Baud rate
*Specifications are subject to change without notice
1
18
37
75
150
For more information on Telenetics’ wireless
products and services, call:
949-455-4000 or visit
w w w.telenetics.com
Chassis GND Option
Chassis GND and Signal GND not connected
Chassis GND and Signal GND connected together
25111 Arctic Ocean Drive
Lake Forest, CA 92630
tel. 949.455.4000 fax. 949.455.4010
Document #0071 0700
Telenetics is registered trademark of Telenetics Corporation.
All other trademarks are the property of their respective holders. ©2000
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