Comtech EF Data CRS-400 - Manual (Page 81)

CRS-400 1:8 Redundancy Switch Revision 0
Remote Control MN/CRS400.IOM
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The ! code (target to controller) 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 with. Example: XYZ!
B.5.5 M ESSAGE A RGUMENTS
Arguments are not required for all messages. Arguments are ASCII codes for the
characters 0 to 9 (ASCII 48 to 57), A to Z (ASCII 65 to 90), period (ASCII 46) and
comma (ASCII 44).
B.5.6 E ND O F P ACKET
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.