Instruction Code; Instruction Code Qualifier - Comtech EF Data LBC-4000 Installation And Operation Manual

LBC-4000 L-Band Up/Down Converter System
Remote Control
A.3.3 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).
A.3.4 I
NSTRUCTION
This single character further qualifies the preceding instruction code.
Code Qualifiers obey the following rules:
1. From Controller-to-Target, the only permitted value is:
They have these meanings:
The '_' code plus additional parameter(s) 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_A_ON would mean 'enable the mute
function of converter A'.
The '_' code without additional parameter 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_A_ would mean 'return the current
state of the mute function of converter A'.
2. From Target-to-Controller:
If the message being sent was successful from controller to target, the target will respond with
the same message being sent.
C
ODE
C Q
ODE UALIFIER
_ (ASCII code 95)
A-4
MN/LBC4000.IOM
Revision 2