Advantech Data Acquisition Modules ADAM 4000 Instrukcja Użytkownika Pobierz pdf (Strona 283)

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Digital I/O and Relay Output

Counter/Frequency Command Set

ADAM 4000 Series User’s Manual

$AA7N

Name Read/Clear Overflow Flag command

Description The command requests the module to return the status of

the overflow flag for either counter 0 or counter 1. Then

clear the flag afterwards.

Syntax $AA7N(cr)

$ is a delimiter character.

AA (range 00-FF) represents the 2-character hexadecimal

address that you will access to.

7 is the Read/Clear Overflow Flag command.

N determines the channel whose overflow flag status

should be read and cleared. When N = 0, it represents

counter 0. On the other hand, N = 1 represents 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

communication error, or even if the specified address does

not exist.

! is a delimiter character which indicates a valid command.

? is a delimiter character which indicates an invalid

command .

AA (range 00-FF) represents the 2-character hexadecimal

address of the 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 for

counter 1 and to reset it. The module replies with the

overflow flag for counter 1indicating overflow. Then it is

being reset.

4080, 4080D

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