DL205 User Manual, 4th Edition, Rev. D
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Chapter 5: Standard RLL Instructions
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Managing the ASCII Strings
The following instructions can be helpful in managing the ASCII strings within the CPU’s
V-memory:
ASCII Find (AFIND) – Finds where a specific portion of the ASCII string is located in
continuous V-memory addresses. Forward and reverse searches are supported.
ASCII Extract (AEX) – Extracts a specific portion (usually some data value) from the ASCII
find location or other known ASCII data location.
Compare V-memory (CMPV) – This instruction is used to compare two blocks of
V-memory addresses and is usually used to detect a change in an ASCII string. Compared data
types must be of the same format (i.e., BCD, ASCII, etc.).
Swap Bytes (SWAPB) – usually used to swap V-memory bytes on ASCII data that was written
directly to V-memory from an external HMI or similar master device via a communications
protocol. The AIN and AEX instructions have a built–in byte swap feature.
ASCII Input (AIN)
The ASCII Input instruction allows the CPU to receive ASCII strings through the specified
communications port and places the string into a series of specified V-memory registers. The
ASCII data can be received as a fixed number of bytes or as a variable length string with a
specified termination character(s). Other features include Byte Swap preferences, Character
Timeout, and user-defined flag bits for Busy, Complete and Timeout Error.
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