Specifications

Connector Pinouts CDM-500 Closed Network Satellite Modem
5–2 Rev. 1.3
• DO NOT connect signals to pins which are not shown - these pins are reserved for
use by the redundancy system
•
‘B’ signal lines are not used for RS232 applications
•
For X.21 operation, use the RS422 pins, but ignore Receive Clock if the Modem is
DTE, and ignore Transmit clocks if the Modem is DCE
5.2 Alarms Connector - 15 Pin ‘D’ Type Male
Table 5-2 Alarms Connector
Pin Description
1 Ground
5 Unit Fault Relay - Normally Open
12 Unit Fault Relay - Normally Closed
4 Unit Fault Relay - Common
8 Receive Traffic Relay - Normally Open
15 Receive Traffic Relay - Normally Closed
7 Receive Traffic Relay - Common
14 Transmit Traffic Relay - Normally Open
6 Transmit Traffic Relay - Normally Closed
13 Transmit Traffic Relay - Common
11 Receive I sample (for constellation display)
3 Receive Q sample (for constellation display)
2 Receive AGC voltage
9 External Carrier Off input
10 ---- No Connection ----
Note:
‘Normally Open’ refers to the NON-FAIL state