Page 3 of 39 Rev. 13
1. CONFIGURATION
The Primax PCOM Communication Card operates in the following modes:
a. Slave Modbus RS-232/485
b. Slave Modbus TCP/IP
c. Slave DNP3 (available only in the R232/485).
The RS-232/485 operates with 8 bits, 1 start and 1 stop bit. The speed of the transmission is configured on the PCOM
board, and selected by switch SW2 (see table 2). The available speeds are 1200, 2400, 4800, 9600 (default), 19200,
38400 and 56000 baud. The address of the PCOM card is on board configurable by switch SW3 (see table 3, and table
8). The default address is “1“for Modbus and “10” for DNP3. The protocol of communication Modbus RS232/485,
Modbus TCP/IP or DNP3 is selected by switch SW1 (see table 1).
1
1 1
GS
TD(B)
TD(A)
RD(B)
RD(A)
1
address Slave
SW3
CONFIG
TCP/IP
SW1
SW2
RATE BAUD
ETHERNET
RS485
SW
5RS232/RS48
J14
DB9
CAN1
CAN2
J2
J4
J15
J8
1.1 COMMUNICATION PROTOCOL
The switch SW1 allows for choosing a communication protocol: Modbus RTU, Modbus TCP/IP or DNP3.
Position of SW1 Chosen protocol
on
1
MODBUS RS232/485
on
1
MODBUS TCP/IP
on
1
DNP3 RS232/485
Table 1: Communication protocol
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