Allen-Bradley SLC 500 Series User Manual

Publication 1747-RM001G-EN-P - November 2008
10-10 ASCII Instructions
Entering Parameters
Enter the following parameters when programming this instruction.
• Channel is the number of the RS-232 port (Channel 0).
• Receive Buffer, when set to Yes, clears the receive buffer and removes
the ARD and ARL instructions from the queue. The Error bit (ER) is
set in each of these instructions.
• Transmit Buffer, when set to Yes, clears the transmit buffer and
removes the AWA and AWT instructions from the queue. The Error bit
(ER) is set in each of these instructions.
Example
When the rung goes true, the selected buffer(s) will be cleared and the ASCII
instruction(s) are removed from the ASCII instruction queue.
IMPORTANT
For SLC 5/03 with OS302, Series C, FRN 7 and higher,
when the ACL instruction is executed with:
• the receive buffer set to No and the Transmit
buffer set to Yes while channel 0 is in System
Mode and configured for DF1.
• the DF1 Remote/Local Passthru bit is set for Local
(S34/6=1).
Two actions occur.
• The ASCII transmit buffer is cleared and any AWA
and AWT instructions in the ASCII queue are
removed
• The Local Passthru queue is flushed

Allen-Bradley SLC 500 Series Specifications

General

Programming Software	RSLogix 500
Series	SLC 500
Category	Controller
Manufacturer	Allen-Bradley (Rockwell Automation)
I/O Capacity	Up to 4096 I/O points
Communication Ports	DH-485
Programming Languages	Ladder Logic
Operating Temperature	0 to 60 °C (32 to 140 °F)
Relative Humidity	5% to 95% (non-condensing)
Memory	4K to 64K words (depending on the processor)
Power Supply	AC or DC (depending on the module)