Comtech EF Data CDM-710L Especificações descarregar pdf (Página 127)

CDM-710 Broadcast Satellite Modem Revision 11

Ethernet Management MN/CDM710.IOM

6–7

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:

<0135/TFQ=0070.2345 {CR}

The modem returns:

>0135/TFQ=

2. The message below requests Tx frequency status:

<0654/TFQ?

The modem response is:

>0654/TFQ= 0070.2345 {CR}{LF}

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Comtech EF Data CDM-710L Especificações Página 127