6.4.2 Using Telnet; Telnet Examples - Comtech EF Data CDM-710 Installation And Operation Manual

CDM-710 Broadcast Satellite Modem
Ethernet Management

6.4.2 Using Telnet

Refer to Appendix A. REMOTE CONTROL in this manual for the syntax and list of
commands and status queries for the modem. Telnet is implemented in the modem Ethernet M&C
in a "Telnet wrapper". When the user Telnets to the modem, it emulates a local RS-232 (RS-485)
serial connection to the modem. The user can then type the same command syntax as would be
used from a serial remote terminal, and the Ethernet M&C "unwraps" the Telnet packet and sends
it on to the base modem processor – which responds to it as if it was a serial remote command.
To summarize:
•
Start of Packet is either a '<' or a '>' where '<' is used to send a command/query to the
modem and '>' is the modem response.
•
Defines the address of the modem (always is 0 in RS-0232).
•
The 3 digit instruction code of the specific command/query.
•
Instruction Code Qualifier. When sending, = will set a parameter, ? is used to query.
•
The modem response will be either =, ?, !, *, #, or ~ (see the specific definitions in the
Remote Control Section).
•
Optional argument.
•
End of packet (CR).

6.4.3 Telnet Examples

1. A controller sends the following command to the modem to program its Tx frequency:
The modem returns:
2. The message below requests Tx frequency status:
The modem response is:
<0135/TFQ=0070.2345 {CR}
>0135/TFQ=
<0654/TFQ?
>0654/TFQ= 0070.2345 {CR}{LF}
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