ICP DAS USA I-7083, Руководство пользователя

Страница: 31 / 48

2.7 ~AA2
z
Description
: Read the status and timer value of host watchdog.
The host watchdog timer is designed for host watchdog. When
the host watchdog is enable, the host must send ~** command to
all modules before the timer is up. When the ~** command is
received, the host watchdog timer is reset and restart. Use
~AA3ETT to enable/disable/setting the host watchdog timer.
z
Syntax
: ~AA2[chk](cr)
~ is a delimiter character
AA=2-character HEX module address, from 00 to FF
[chk]=2-character checksum, if checksum disable
Æ
no [chk]
(cr)=0x0D
z
Response
: valid command
Æ
!AASTT[chk](cr)
invalid command
Æ
?AA[chk](cr)
no response
Æ
syntax error or communication
error or address error
! is a delimiter character indicating a valid command
? is a delimiter character indicating a invalid command
AA=2-character HEX module address
S=0: host watchdog is disable
S=1: host watchdog is enable
TT=2-character HEX value, from 00 to FF, unit=0.1 second
[chk]=2-character checksum, if checksum disable
Æ
no [chk]
(cr)=0x0D
z
Example
:
command: ~012(cr)
response : !01000(cr)
command: ~022(cr)
response : !0210A(cr)
Host watchdog timer of
module 01 is disable
host watchdog timer of
module 02 is enable and =
0.1*10 = 1 second.
I-7083/7083D/7083B/7083BD User Manual (V 1.1, Dec/2007) ------------------ 31