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CDM-Qx Satellite Modem Revision 4
Remote Control MN/CDMQx.IOM
C-5
C.4.4 Instruction Code Qualifier
This is a single character that further qualifies the preceding instruction code.
Code Qualifiers obey the following rules:
1. From Controller-to-Target, the only permitted values are:
= (ASCII code 61)
? (ASCII code 63)
They have these meanings:
The ‘=’ code (controller-to-target) is used as the assignment operator and is used to
indicate that the parameter defined by the preceding byte should be set to the value of
the argument(s) which follow it.
For example, in a message from controller to target, TFQ=0950.0000 would mean ‘set
the transmit frequency to 950 MHz.’
The ‘?’ code (controller to target) is used as the query operator and is used to indicate
that the target should return the current value of the parameter defined by the
preceding byte.
For example, a message from the controller to target, TFQ? Would mean ‘return the
current value of the transmit frequency.’
2. From Target to Controller, the only permitted values are:
= (ASCII code 61)
? (ASCII code 63)
! (ASCII code 33)
* (ASCII code 42)
# (ASCII code 35)
~ (ASCII code 126)
$ (ASCII code 36)
^ (ASCII code 94)
@ (ASCII code 64)
They have these meaning:
The ‘=’ code (Target to Controller) is used in two ways: