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REMOTE CONTROL OPERATION
This appendix describes the remote control operation of the SDM-100, -100A, -150, and -150A.
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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.
Rev. 0
Firmware number:
FW/4969-1C and FW/4969-2C
Software version:
14.7.4
Appendix A.
A–1
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