Measurement Computing CB-7080 - Manual (Page 23)

CB-7080 & CB-7080D Counter/Timer User's Guide ~AA2
2-5
~AA2
Description: Reads the status and timer value of host watchdog. When the host watchdog is enabled, the host
must send ~** command to all modules before the timer times-out. When the ~** command is received, the
host watchdog timer is reset and starts counting down. Use ~AA3ETT to enable/disable/setting the host
watchdog timer.
Syntax: ~AA2[chk](cr)
~ A delimiter character
AA 2-character HEX module address, from 00 to FF
[chk] 2-character checksum. If checksum is disabled, no [chk]
(cr) 0x0D
Response :
Valid response AASTT[chk](cr)
invalid response ?AA[chk](cr)
no response Syntax error, communication error or address error
! A delimiter character indicating a valid response
? A delimiter character indicating an invalid response
AA 2-character HEX module address
S=0 Host watchdog is disabled
S=1 Host watchdog is enabled
TT 2-character HEX value, from 00 to FF, unit=0.1 second
[chk] 2-character checksum. If checksum is disabled, no [chk].
(cr) 0x0D
Examples :
Host watchdog timer of module 01 is disabled
command: ~012(cr)
response: !01000(cr)
Host watchdog timer of module 02 is enabled and time-out
time = 0.1 x 10 = 1 second
command: ~022(cr)
response: !0210A(cr)