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Technical Description CP 523

RS-232-C (V.24) interface with handshake ON

The RS-232-C (V.24) interface of the CP 523 can handle the following signals in handshake ON

mode:

Table 2-2. Valid Control Signals of the RS-232-C (V.24) Interface in Handshake ON Mode

Control signal State Meaning

TXD Send data

CP holds send line at logic 1 when not transmitting

(V -3 V).

Outputs

DTR

OFF

Data Terminal Ready

CP 523 switched on; ready to receive

CP 523 not switched on; not ready to receive

RTS

OFF

Request to send

CP 523 ready to send

CP 523 not sending

Inputs

RXD Receive data

Receive line must be held at logic 1 by the peripheral

device (V -3 V).

CTS

Clear to send

Peripheral device can receive characters from the

CP 523

The CP expects this as reply to RTS = "ON"

DSR

OFF

Data set ready

Peripheral device switched on; ready to receive

Peripheral device not switched on; not ready to receive

Peripheral device cannot receive characters from the

CP 523

OFF

An XON/XOFF protocol is not possible if you evaluate the control signals (handshake ON).

In 3964(R) mode, handshaking is not possible (hardware signals are neither evaluated nor

affected).

Note:

2-8

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