Rs485; Controlling The Rs 485 Transmitter; Fig. 8-7: Rs 422 Cabling For Serial Port 2; Fig. 8-8: Enabling The Automatic Transmitter With The Signals Dtra(B), Rtsa(B) Or Data-Dir-1 - Addi-Data ADDICOM PA 7400 Series Technical Description

PA 7400

8.3.3 RS485

Controlling the RS 485 transmitter

Refer to Chapter 5.2 Jumper settings and functions
Fig. 8-8: Enabling the automatic transmitter with the signals DTRA(B), RTSA(B)
•
Make sure that the values of data bits D2-D7 are not overwritten when writing
in the MODEM CONTROL REGISTER A(B) on Base-S1(2) +4.
38

Fig. 8-7: RS 422 cabling for serial port 2

or DATA-DIR-1(2) through jumper J11(6)
Technical description Chapter 8