Westermo TD-23 Manual de Instalação descarregar pdf (Página 48)

48 6178-2203

Dial up with hardware signalling

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.

The modem reacts on the first rising edge which means that one pulse is sufficient.

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.

The modem does not have a redialling function. If necessary this must be handled by other

equipment connected. We advise the DCD signal to be used as a control indicating whether

connection was made or not.

AT&B1 Dial-up using DTR.

AT&D3 Hang-up if DTR goes low.

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

Please also refer to ”To use minicall”, as the minicall and the dial-up with

hardware signalling can be used together.

External signal

1 2 ... 43 44 45 46 47 48 49 50 51 52 53 54 55 56

Sem comentários

Westermo TD-23 Manual de Instalação Página 48