Allen-Bradley Logix5000

Rockwell Automation Publication 1756-RM003N-EN-P - October 2011 585
ASCII Serial Port Instructions (ABL, ACB, ACL, AHL, ARD, ARL, AWA, AWT) Chapter 17
ASCII Handshake Lines
(AHL)
The AHL instruction obtains the status of control lines and turns on or off the
DTR and RTS signals.
Operands:
Relay Ladder
EN
DN
ER
ASCII Handshake Lines
Channel ?
AND Mask
?
??
OR Mask ?
??
SerialPort Control ?
Channel Status(Decimal) ?
AHL
Operand Type Format Enter
Channel DINT Immediate
Tag
0
ANDMask DINT Immediate
Tag
Refer to the description.
ORMask DINT Immediate
Tag
Serial Port Control SERIAL_PORT_CONTROL Tag Tag that controls the operation
Channel Status (Decimal) DINT Immediate 0
During execution, displays the status of the control lines.
For the Status Of This Control Line Examine This Bit:
CTS 0
RTS 1
DSR 2
DCD 3
DTR 4
Received the XOFF character 5