ABB LDSTA-01 Serial I/O function

Description

For reference, see the tables under Serial Port Pin Assignments in Chapter 5.

Support for the DTR output signal is provided for COM1 only, on all RX7i and RX3i models (except

CPE305 and CPE330), in Rel 7.16 and later releases.

For CPU COM2 (RS-485), the RTS signal is also controlled by the transmit driver. Therefore, control of

RTS is dependent on the current state of the transmit driver. If the transmit driver is not enabled,

asserting RTS with the Write Port Control COMMREQ will not cause RTS to be asserted on the serial

line. The state of the transmit driver is controlled by the protocol and is dependent on the current

Duplex Mode of the port. For 2-wire and 4-wire Duplex Mode, the transmit driver is only enabled

during transmitting. Therefore, RTS on the serial line will only be seen active on COM2 (configured for

2-wire or 4-wire Duplex Mode) when data is being transmitted. For point-to-point Duplex Mode, the

transmit driver is always enabled. Therefore, in point-to-point Duplex Mode, RTS on the serial line will

always reflect what is chosen with the Write Port Control COMMREQ.

This feature allows the CPU to automatically dial a modem and send a specified byte string.

To implement this feature, the port must be configured for Serial I/O. After the autodial function is

executed and the modem has established a connection, other serial I/O functions (Write bytes, Set

Up Input Buffer, Flush Input buffer, Read port status, Write port control, Read bytes, Read String, and

Cancel Operation) can be used.

Example

Pager enunciation can be implemented by three commands, requiring three COMMREQ command

blocks:

Autodial:

04400 (1130h)

Dials the modem.

Write Bytes:

04401 (1131h)

Specifies an ASCII string, from 1 to 250 bytes in length, to send from the serial port.

Autodial:

04400 (1130h)

It is the responsibility of the application program to hang up the phone

connection. This is accomplished by reissuing the autodial command and sending

the hang up command string

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