Automationdirect.com DL06 - Page 371

DL06 Micro PLC User Manual, 3rd Edition, Rev. E
5-210
Chapter 5: Standard RLL Instructions
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ASCII Instructions
The DL06 CPU supports several instructions and methods that allow ASCII strings to be read
into and written from the PLC communications ports. Specifically, port 2 on the DL06 can be
used for either reading or writing raw ASCII strings, but cannot be used for both at the same
time. The DL06 can also decipher ASCII embedded within a supported protocol (K–Sequence,
DirectNet, Modbus) via the CPU port.
Reading ASCII Input Strings
There are several methods that the DL06 can use to read ASCII input strings.
1) ASCII IN (AIN) – This instruction configures port 2 for raw ASCII input strings with
parameters such as fixed and variable length ASCII strings, termination characters, byte
swapping options, and instruction control bits. Use barcode scanners, weight scales, etc. to
write raw ASCII input strings into port 2 based on the (AIN) instruction’s parameters.
2) Write embedded ASCII strings directly to V–memory from an external HMI or similar
master device via a supported communications protocol using the CPU ports. The AIN
instruction is not used in this case. 3) If a DL06 PLC is a master on a network, the Network
Read instruction (RX) can be used to read embedded ASCII data from a slave device via
a supported communications protocol using port 2. The RX instruction places the data
directly into V–memory.
Writing ASCII Output Strings
The following instructions can be used to write ASCII output strings:
1) Print from V–memory (PRINTV) – Use this instruction to write raw ASCII strings out
of port 2 to a display panel or a serial printer, etc. The instruction features the starting
V–memory address, string length, byte swapping options, etc. When the instruction’s
permissive bit is enabled, the string is written to port 2.
2) Print to V–memory (VPRINT) – Use this instruction to create pre–coded ASCII strings in
the PLC (i.e. alarm messages). When the instruction’s permissive bit is enabled, the message
is loaded into a pre–defined V–memory address location. Then the (PRINTV) instruction
may be used to write the pre–coded ASCII string out of port 2. American, European and
Asian Time/Date stamps are supported.
Additionally, if a DL06 PLC is a master on a network, the Network Write instruction (WX)
can be used to write embedded ASCII data to an HMI or slave device directly from V–memory
via a supported communications protocol using port 2.
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