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SLM-5650 Satellite Modem Revision 1
Remote Control MN/SLM5650.IOM
B–5
From Target to Controller, the only permitted values are:
Symbol Definition
=
(ASCII code 61)
The ‘=’ code is used in two ways:
a. If the controller has sent a query code to a target
(Example: TFQ? (meaning ‘what’s the Transmit frequency?’), the target would
respond with TFQ=xxxx.xxxx, where xxxx.xxxx represents the frequency in
question.
b. If the controller sends an instruction to set a parameter to a particular value,
then, providing the value sent is valid, the target will acknowledge the message
by replying with TFQ=(with no message arguments)
?
(ASCII code 63)
If the controller sends an instruction to set a parameter to a particular value, then,
if the value sent is not valid, the target will acknowledge the message by replying
(for example) with TFQ? (with no message arguments). This indicates that there
was an error in the message sent by the controller.
!
(ASCII code 33)
If the controller sends an instruction code which the target does not recognize, the
target will acknowledge the message by echoing the invalid instruction, followed
by the ! character with: Example: XYZ!
*
(ASCII code 42)
If the controller sends an instruction to set a parameter to a particular value, then,
if the value sent is valid, BUT the modulator will not permit that particular
parameter to be changed at this time, the target will acknowledge the message by
replying (for example) with TFQ* (with message arguments).
#
ASCI code 35)
If the controller sends a correctly formatted command, BUT the modulator is not in
remote mode, it will not allow reconfiguration and will respond with TFQ#
B.5.5 Message Arguments
Arguments are not required for all messages. Arguments are ASCII codes for the
characters 0 to 9 (ASCII 48 to 57), period (ASCII 46) and comma (ASCII 44).
B.5.6 End Of Packet
Controller to Target: This is the ‘Carriage Return’ character (ASCII code 13)
Target to Controller: This is the two-character sequence ‘Carriage Return’, ‘Line Feed’.
(ASCII code 13, and code 10.) Both indicate the valid termination of a packet