Instruction Code Qualifier - Comtech EF Data MBT-4000B User's Installation And Operation Manual

MBT-4000B Multi-band Transceiver System
Serial-based Remote Product Management
Both upper case and lower case alphabetic characters may be used (A-Z and a-z, ASCII codes 65-90 and 97-122).

6.2.4.5 Instruction Code Qualifier

This single character further qualifies the preceding instruction code. Code Qualifiers obey the following rules:
1. From Controller-to-Target, the only permitted values are:
This character 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) that follow it. For Example: In a message from Controller-to-Target, MUT=1 would mean 'enable the
(ASCII code 61
Mute function'.
This character 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? would mean 'return the current state of the
(ASCII code 63)
Mute function'.
2. From Target-to-Controller, the only permitted values are:
This character is used in two ways:
=
(ASCII code 61)
First, if the Controller has sent a query code to a Target (for Example: MUT?, meaning 'is the 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'.
Second, if the Controller sends an instruction to set a parameter to a particular value, and if the value sent in the argument is valid, then
the Target will acknowledge the message by replying with MUT= (with no message arguments).
This character is used only if the Controller sends an instruction to set a parameter to a particular value, then, if the value sent in the
?
argument is not valid, the Target will acknowledge the message by replying, for example, with MUT? (with no message arguments). This
(ASCII code 63)
indicates that there was an error in the message sent by the Controller.
This character is used only 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. Example: XYZ!
(ASCII code 33)
This character is used only if the Controller sends an instruction to set a parameter to a particular value, then, if the value sent in the
*
argument is valid, BUT the Target is in the wrong mode (e.g., standby mode in redundancy configuration) and will not permit that
(ASCII code 42)
particular parameter to be changed at that time, the Target will acknowledge the message by replying, for example, with MUT* (with no
message arguments).
#
(ASCII code 35)
This character is used only if the Controller sends an instruction code which the Target cannot currently perform because of hardware
resource issues, then the Target will acknowledge the message by echoing the invalid instruction, followed by the # character.
6–5
Revision 1
MN/MBT4000B.IOM