ABB 07CR41, Operating Manual, Page: 107 / 124

Advant Controller AC 31 / Issued: 01.99
6 – 13 Communication
3
6.3 Point-to-point communication with the integrated ASCII interface
40 or 50
series
ASCII communication
Figure 9: Example of ASCII configuration
6.3.1 Protocol description
ASCII communication is a protocol which enables the exchange of text coded in ASCII
(American Standard Code of Information Interchange) between two devices, for example.
This protocol may be used by the 40 and 50 series basic units to communicate with a printer or
terminal fitted with a ASCII interface (Figure 7).
6.3.2 Configuration of the communication
Using a black 07 SK 51 or 07 SK 53 cable
The serial interface of the 40 and 50 series basic units is configured by default in programming
and test mode with the grey 07 SK 51 or 07 SK 53 cable and in MODBUS
®
mode with the
black 07 SK 51 or 07 SK 53 cable.
To change the programming mode to ASCII mode, the system constant KW 00,06 must be
changed (see chapter 5)
Communication parameters
There isn’t a default configuration. It is therefore necessary to configure the communication
partners (speed, stop bits, data bits, parity, end of frame) with the SINIT function (see the
description of the functions) in the user program.
6.3.3 Programming
In addition to the mandatory SINIT function for parameter configuration, there are also two
other functions for ASCII communication.
Sending messages
An ASCII message is sent from one 40 or 50 series basic unit to another device by means of
the DRUCK function in the user program.
Receiving messages
An ASCII message is received on a 40 or 50 series basic unit with the EMAS function.
A detailed description of the SINIT, DRUCK and EMAS functions can be found in the functions
documentation.