Chapter 4 Command Set 4-187
4080, 4080D
Chapter 4
$AA7N
Name Read/Clear Overflow Flag.
Description The command requests the addressed module to return the
status the overflow flag of counter 0 or counter 1 and clear the
flag afterwards.
Syntax $AA7N(cr)
$ is a delimiter character.
AA (range 00-FF) represents the 2-character hexadecimal
address of counter/frequency module that you want to interro-
gate.
7 identifies the Read/Clear Overflow Flag command
N determines the channel which overflow flag status should be
read and cleared. N = 0 represents counter 0 and N = 1 repre-
sents counter 1
(cr) is the terminating character, carriage return (0Dh)
Response !AAV(cr) if the command is valid.
?AA(cr) if an invalid operation was entered.
There is no response if the module detects a syntax or commu-
nication error, or if the specified address does not exist.
! is a delimiter character indicating the command was valid.
? is a delimiter character indicating the command was invalid.
AA (range 00-FF) represents the 2-character hexadecimal
address of a counter input module.
V represents the status of the Nth channel's overflow flag.
V = 1 means that the overflow flag has been set because the
counting has exceeded the maximum count. V = 0 means that
the overflow flag has not been set.
(cr) is the terminating character, carriage return (0Dh).
Example command: $1371(cr)
response: !131(cr)
The command requests the counter/frequency module at
address 13 to return the status of the overflow flag of counter 1
and reset it. The addressed module replies that the overflow
flag for counter 1 indicated overflow and was reset.
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