Westermo TD-23 Manual de Instalação descarregar pdf (Página 35)

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A frequently used setting 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.

6 common settings are providing with SW1: 1, 2, 3.

The PLC Mode settings are as follows:

SW1: 4 Commands that are sent from the terminal/computer etc.

are not echoed back to the RS-232/V.24 connection until DCD is active.

AT&C1 DCD will follow the carrier on the line.

AT&K0 No handshaking.

Remark: SW1:4 ON (Ignore DTE Characters) may be combined with the settings above to avoid an

abort during call estabilishment.

Dial up with hardware signalling “DTR-Hotcall”

Dial up can be made by applying an external signal to the DTR-pin in the RS-232/V.24 contact.

A typical application is an alarm signal from a PLC or another relay contact (as shown in figure).

The modem reacts on the first rising edge which means that one pulse is sufficient if it remains active

during the connection.

The signal level should be in compliance with the RS-232/V.24 standard. If only a relay contact

is available the DSR-pin will provide a suitable voltage.

AT&S0 DSR-pin ON.

SW1:1, 2, 3 DTE Speed and Format setting.

AT&D2 Hang-up if DTR goes low.

AT&Z0=nn The number to dial, nn, is stored in memory position 0.

DTR pin active (sets the connection).

Remark: SW1:4 ON (Ignore DTE Characters) may be combined with the settings above to avoid an

abort during call estabilishment.

DTRDSR

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Westermo TD-23 Manual de Instalação Página 35