Rev. 3
B-1
B
Appendix B.
REMOTE CONTROL OPERATION
This appendix describes the remote control operation of the SDM-2020 demodulator.
•
Firmware number:
FW/7734-1
•
Software version:
20.1.1
B.1 General
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.
Communications on the remote link are initiated by a remote controller or terminal. The
demodulator never transmits data on the link, unless it is commanded to do so.
B.2 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
Содержание SDM-2020
Страница 20: ...SDM 2020 Satellite Demodulator Introduction Rev 3 1 5 2 Data and symbol rates become effective January 1999...
Страница 30: ...SDM 2020 Satellite Demodulator Introduction Rev 3 1 15 Figure 1 7 16QAM 3 4 7 8 Reed Solomon Decoder...
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