Comtech EF Data C Installation And Operation Manual page 32

HPOD
Customer Commands
4.13.3 I
NSTRUCTION
This is a three-character alphabetic sequence that identifies the subject of the message.
Wherever possible, the instruction codes have been chosen to have some significance.
This aids in the readability of the message, should it be displayed in its raw ASCII form.
Upper case and lower case alphabetic characters may be used (A-Z, and a-z).
4.13.4 I
NSTRUCTION
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:
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, MUT=1 would mean 'enable
the mute function'.
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, in a message from controller to target, MUT? denotes 'return the
current state of the mute function'.
2. From Target to Controller, the only permitted values are:
They have these meanings:
The '=' code (target to controller) is used in two ways:
First, if the controller has sent a query code to a target (for example MUT?, meaning
'is mute enabled or disabled?'), the target would respond with MUT=x, where x
represents the state in question, 1 being 'enable' and 0 being disable.
C
ODE
C Q
ODE UALIFIER
= (ASCII code 61)
? (ASCII code 63)
= (ASCII code 61)
? (ASCII code 63)
! (ASCII code 33)
* (ASCII code 42)
# (ASCII code 35)
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MN/HPOD.IOM