Rockwell-automation 1794-L34 FlexLogix Controller System User Manual Manual de usuario descargar pdf (Pagina 37)

Publication 1794-UM001G-EN-P - January 2007

Communicate over Networks 37

The controller supports several instructions to manipulate ASCII

characters. The instructions are available in ladder diagram (LD) and

structured text (ST).

Read and write ASCII characters

Create and modify strings of ASCII characters

If you want to: Use this instruction:

determine when the buffer contains termination characters ABL

count the characters in the buffer ACB

clear the buffer ACL

clear out ASCII Serial Port instructions that are currently

executing or are in the queue

obtain the status of the serial port control lines AHL

turn on or off the DTR signal

turn on or off the RTS signal

read a fixed number of characters ARD

read a varying number of characters, up to and including the

first set of termination characters

ARL

send characters and automatically append one or two

additional characters to mark the end of the data

AWA

send characters AWT

If you want to: Use this instruction:

add characters to the end of a string CONCAT

delete characters from a string DELETE

determine the starting character of a sub-string FIND

insert characters into a string INSERT

extract characters from a string MID

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Rockwell-automation 1794-L34 FlexLogix Controller System User Manual Manual de usuario Pagina 37