Comtech EF Data SDM-100A - Manual (Page 153)

Rev. 0 A–1
Appendix A.
REMOTE CONTROL OPERATION
This appendix describes the remote control operation of the SDM-100, -100A, -150, and -150A.
• Firmware number: FW/4969-1C and FW/4969-2C
• Software version: 14.7.4
The -2 version is the PLCC (Plastic Leadless Chip Carrier) version, applicable to the SDM-100A and -
150A.
The -1 version is the 28-pin DIP version, applicable to the SDM-100 and -150.
A.1 General
Remote controls and status information are transferred via an RS-485 (optional RS-232-C) serial
communications link.
Commands and data are transferred on the remote control communications link as US ASCII-encoded
character strings.
The remote communications link is operated in a half-duplex mode.
Communications on the remote link are initiated by a remote controller or terminal. The modem never
transmits data on the link unless it is commanded to do so.