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14
The communication port
COM2
is available either in the 25-pin
connector or in the 9-pin connector, but only in interface RS232
(protocol
MODBUS SLAVE
, format
8,N,1
, baud rate settable).
Usually this is the communications port used for
programming the terminal through a PC
(see Chapter 4).
3.2.3.1 COM2 on DB25 connector pins
PIN 7 GND
PIN 12 TX - RS232
PIN 11 RX - RS232
DB25FE
3.2.3.2 COM2 on DB9 connector pins
PIN 5 GND
PIN 3 TX - RS232
PIN 2 RX - RS232
DB9 FE
3.3 NPN digital inputs
In DB25 connector pins, 8 NPN digital inputs are present. The
digital input is active if the respective PIN is short-circuited with
GND (PIN 5, reference).