Remote Control Operation
SDM-2020 Satellite Demodulator
B–2
Rev. 3
Messages on the remote link are commands and responses.
Commands are messages, which are transmitted to a satellite demodulator, while responses
are messages returned by a satellite demodulator in response to a command.
The general message structure is as follows:
•
Start Character
•
Device Address
•
Command/Response
•
End of Message Character
B.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
B.2.2 Device
Address
The device address is the address of the one satellite demodulator 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. 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 demodulator who is connected to a common remote communications link
must be assigned its own unique address.
Содержание SDM-2020
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