Comtech EF Data SMS-7000, Installation And Operation Manual

Page: 117 / 148

Rev. 3 Draft A–1
A
Appendix A.
REMOTE CONTROL OPERATION
This appendix describes the remote control operation of the switch.
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Firmware number: FW/4958-1J
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Software version: 2.1.8
A.1 General
The remote controls and status for the switch are based on the SMS-658 and SMS-758
redundancy switches to facilitate the use of existing control code to the extent possible.
Due to unique and advanced features of the switch, there are differences, additions, and
deletions from the former command set. These changes are highlighted in bold type in the
comparison chart, Table A-1.
Remote controls and status information are transferred via a 2-/4-wire 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 at baud rates from 110
to 19200 bit/s.
Communications on the remote link are initiated by a remote controller or terminal. The
switch never transmits data on the link unless it is commanded.
Command and status parameter selection will be determined by whether the backup modem
switching mode has been configured as Independent or Dependent. The switch will default
to Independent mode after a cold startup or hard reset.