Comtech EF Data SDM-650B - Manual (Page 44)

Configuration SDM-650B Satellite Modem
3–2 Rev. 5
Figure 3-1. M&C Card
3.1.1 Description of Options
3.1.1.1 Remote Interface
All modem functions can be remotely controlled and monitored via an RS-485 (optional
RS-232-C) communications link.
• The 2-wire, half-duplex RS-485 interface makes it possible to operate
255 modems on a common communications link.
• The RS-232-C interface is used to communicate with a single modem.
The M&C module must be hardware configured to one of the two interfaces.
Perform the following steps to configure the M&C for RS-485 operation:
1. Remove jumpers JP4, JP5, and JPX.
2. Install jumpers JP1, JP2, and JP3.
3. Connect JP7 to RS-485.
Perform the following steps to configure the M&C for RS-232-C operation:
1. Remove jumpers JP1, JP2, and JP3.
2. Install jumpers JP4, JP5, and JPX.
3. Connect JP7 to RS-232-C.