Installation
PSM-500/500L/500LT SCPC Satellite Modem
Page 2-8
PSM-500/500L/500L T- Rev. 0.91
Table 2–2.
Remote Control Connector J6 Pin Assignment
P2 Pin #
Signal Name
Use
Direction
1
Transmit B
RS–485 Transmit Data (B) +
Output
2
Transmit
RS–232 Transmit Signal
Output
3
Receive
RS–232 Receive Signal
Input
4
Not Used
5
Common
RS-232 Signal Common
I/O
6
Transmit A
RS-485 Transmit Data (A) -
Output
7
Not Used
8
Receive B
RS-485 Receive Data (B) +
Input
9
Receive A
RS-485 Receive Data (A) -
Input
Refer to Appendix C, “Cabling Specifications” for information on making a remote control cable.
2.3.3 Alarm Connection
The modem has two form-C dry contact alarm relays on board and an alarm connector located
on the rear panel, the 9-pin male “D” sub connector J5.
The two relays are designated “A” and “B” and the particular alarms that are summarized on each
relay are programmable from the front panel of the unit or via remote control. Connection to the A
and B relays is via the proper set of pins as shown in Table 2-5 below and programming the
applicable alarm entries via the front panel control or remote control. Non-Alarm is defined as the
powered state of the relay resulting in an alarm when power is lost.
The analog monitor output is programmable from the front panel to select either receive Eb/No,
receive AGC voltage or transmit output power.
Table 2–3.
Alarm Connector J5 Pin Assignment
J5 Pin #
Connection
1
Relay A - NO on Alarm
2
Relay A - Common
3
Relay A - NC on Alarm
4
No Connection
5
Analog Monitor Output (1kOhm)
6
GND for analog monitor
7
Relay B - NO on Alarm
8
Relay B - Common
9
Relay B - NC on Alarm
Note:
By convention “NO”
means Normally Open,
and “NC” means Normally
Closed.
Both conditions are the
non-powered, Alarm State.
