Comtech EF Data PCB-4000 - Manual (Page 54)

PCB-4000 1+1 Phase Combiner Revision 2
Serial Remote Control MN/PCB4000.IOM
5–6
Symbol Definition
!
(ASCII code 33)
The ! code is only used as follows:
If the Controller sends an instruction code that the Target does not recognize, the Target will acknowledge the message by echoing
the invalid instruction, followed by the ! character; for example, XYZ!
*
(ASCII code 42)
The * code is only used as follows:
If the Controller sends an instruction to set a parameter to a particular value, but then the value sent in the argument is valid but the
target is in the wrong mode (e.g., Standby mode in Redundancy configuration), such that it will not permit that particular parameter to
be changed at that time, the Target will acknowledge the message by replying (for example) with MUT* (with no message arguments).
#
ASCI code 35)
The # code is only used as follows:
If the controller sends an instruction code that 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; for example, MUT# (with no
message arguments).
5.2.2.7 Optional Message Arguments
Arguments are not required for all messages. Arguments are ASCII codes for the characters 0 to 9 (ASCII codes 48 to 57), period (ASCII
code 46) and comma (ASCII code 44).
5.2.2.8 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 codes 13 and 10).
Both indicate the valid termination of a packet.