Publication 1766-RM001A-EN-P - October 2008
ASCII Instructions 381
• Index value is less than 1 or greater than 82
• Number value is less than 1 or greater than 82
• Index value greater than the length of the Source string
The Destination string is not changed in any of the above error
conditions. When the ASCII String Manipulation Error bit (S:5/15) is set,
the Invalid String Length Error (1F39H) is written to the Major Error Fault
Code word (S:6).
AHL - ASCII Handshake
Lines
Instruction Type: output
The AHL instruction is used to set or reset the RS-232 Request to Send
(RTS) handshake control line for a modem. The controller uses the two
masks to determine whether to set or reset the RTS control line, or leave it
unchanged. The channel configuration must be set to ASCII.
Entering Parameters
Enter the following parameters when programming this instruction:
• Channel is the number of the RS-232 port, Channel 0.
• AND Mask is the mask used to reset the RTS control line. Bit 1
corresponds to the RTS control line. A value of “2” in the AND mask
resets the RTS control line; a value of “0” leaves the line unchanged.
• OR Mask is the mask used to set the RTS control line. Bit 1
corresponds to the RTS control line. A value of “2” in the OR mask
sets the RTS control line; a value of “0” leaves the line unchanged.
• Control is the control data file. See page 365.
EN
DN
ER
AHL
Ascii Handshake Lines
Channel 0
AND Mask 0002h
OR Mask 0000h
Control R6:2
Channel Status 0000h<
Error 0<
AHL
Execution Time for the AHL Instruction
Controller When Instruction Is:
True False
MicroLogix 1400 26.5267 µs 2.9480 µs
TIP
Make sure the automatic modem control used by the port does not conflict
with this instruction.
efesotomasyon.com - Allen Bradley,Rockwell,plc,servo,drive
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