Comtech EF Data SDM-2020 - Manual (Page 201)

A–1
Appendix A. REMOTE CONTROL
COMMANDS
This appendix describes the remote control operation of the demodulator.
A.1 General
Firmware number: FW/6224-1V Software Version: 6.4.2
FW/7334-1C Software Version: 22.2.1
Remote controls and status information are transferred via an EIA-485 (optional EIA-232)
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.
A remote controller or terminal initiates communications on the remote link. The
demodulator never transmits data on the link, unless it is commanded to do so.
A.1.1 Message Structure
The ASCII character format used requires 11 bits/character:
• 1 start bit
• 1 parity bit (Not applicable to 8 information bit setup)
• 2 stop bits
• 7 information bits or 8 information bits with no parity bit
Messages on the remote link are commands and responses.