Comtech EF Data CRS-500 - Manual (Page 168)

CRS-500 1:N Redundancy System Revision 2
Serial-based Remote Product Management MN-CRS500
9–8
Symbol Definition
?
(ASCII code 63)
The ? code is only used 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 BKH? (with no message arguments).
This indicates that there was an error in the argument of the message sent by the Controller.
*
(ASCII code 42)
The * code is only used 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 modem will not permit that particular parameter to be changed at that time, the Target will acknowledge the
message by responding with, for example, BKH* (with no message arguments).
#
(ASCII code 35)
The # code is only used if the Controller sends a correctly formatted command, BUT the modem is not in remote mode, it will not allow
reconfiguration, and will respond with, for example, BKH# (with no message arguments).
∼
(ASCII Code 126)
The ∼ code is only used if a message was sent via the Switch to an attached modem or ODU, the message was transmitted
transparently through the Switch. In the event of the other device not responding, the Switch would generate a response, for example.
>0100/MGC∼ indicating that it had finished waiting for a response and was now ready for further COMs.
!
(ASCII code 33)
The ! code is only used 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 with. Example: XYZ!
9.4.2.6 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).
9.4.2.7 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.