Comtech EF Data OM20 User Manual
Page 70
OM20 Universal Outdoor Modem
Rear Panel Interfaces
MN-OM20– Revision 5
5–4
configuration is available on the OM20 GUI. Refer to Table 5.3 for the Remote/Terminal
connector pinout; and
Section
6 for the port interface specification.
The OM20’s internal M&C system is connected to most of the circuitry on any board contained
in the chassis. These connections provide status on the condition of the circuitry and provide the
data required for the various measurements the OM20 provides. The on-board M&C processes
this information and generates status indications and alarms when necessary. Detailed status
information is available via the GUI, Remote port, and the Form-C fault connections available on
this connector. This summary information can be connected to external equipment, switches, or
alarms. Refer to Table 5.3 for the Form-C connector pin-outs.
Table 5.3. Remote/Terminal/Fault Connector (J2)
Pin No.
Signal Name
Signal
Direction
A
Receive Data RS-232
RXD-232
Input
B
Transmit Data RS-232
TXD-232
Output
C
AGC Voltage
---
---
D
Transmit Data RS-485 (+)
TX-485-B
Output
E
Transmit Data RS-485 (-)
TX-485-A
Output
F
Receive Data RS-485 (+)
RX-485-B
Input
G
Receive Data RS-485 (-)
RX-485-A
Input
H
Ground
GND
---
J
Mod Fault – C
MF-C
---
K
Mod Fault – NC
MF-NC
---
L
Mod Fault – NO
MF-NO
---
M
Demod Fault
DF-C
---
N
Demod Fault – NC
DF-NC
---
S
Demod Fault – NO
DF-NC
---
R
Ground
GND
---
U
Default
---
---
P
Default
---
---