Comtech EF Data SDM-650B Dokumentacja Pobierz pdf (Strona 370)

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101

SDM-300L3 Satellite Modem Revision 0

Remote Control Operation MN/SDM300L3.IOM

A–2

A.2 Message Structure

The ASCII character format used requires 11 bits/character:

• 1 start bit

• Information and Parity bits (select one)

• 7 information bits and 1 parity bit (Odd/Even) or 8 information bits (None)

• 2 stop bits

Messages on the remote link fall into the categories of commands and responses.

Commands are messages which are transmitted to a satellite modem, while responses are

messages returned by a satellite modem in response to a command.

The general message structure is as follows:

• Start Character

• Device Address

• Command/Response

• End of Message Character

A.2.1 Start Character

A single character precedes all messages transmitted on the remote link. This character flags

the start of a message. This character is:

“<” for commands

“>” for responses

A.2.2 Device Address

The device address is the address of the one satellite modem which is designated to receive

a transmitted command, or which is responding to a command.

Valid device addresses are 1 to 3 characters long, and in the range of 1 to 255.

Note: Address 0 is reserved as a global address which simultaneously addresses all devices

on a given communications link. Devices do not acknowledge global commands.

Each satellite modem which is connected to a common remote communications link must

be assigned its own unique address. Addresses are software selectable at the modem, and

must be in the range of 1 to 255.

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