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6178-2203
Frequently used settings for PLC-systems
and industrial applications
Most PLC-systems and other industrial applications where modems are used require the same
changes to the standard settings.
The most commonly encountered problems concern speed, parity and control signals from the
connected equipment.
Speed and parity are changed with the switches under the cover in block SW4. If this action does
not solve the problem the modem’s answering codes and possible echoing of commands might
be the source of the difficulty.
Below follows a list of commands that might resolve the problems. The commands may of course
be placed on one single command line if desired.
(Se example to the left)
ATV0
Gives the answering codes in short format. (digits)
ATQ1
No result codes are sent on the RS-232/V.24 connection.
ATE0
Commands that are sent from the terminal/computer etc.
are not echoed back to the RS-232/V.24 connection.
AT&C1
DCD will follow the carrier on the line.
AT&K0
No handshaking.
AT&A1
Character abort option on.
For further information regarding these commands please refer to the specific section of this manual.
