B&B Electronics GW-7552 - Manual - Manual (Page 9)

GW-7552 PROFIBUS/MODBUS GATEWAY User Manual (Version 1.40, Apr/2012) PAGE: 9
2.3 Wiring and Jumper Setting Instructions
The GW-7552 module supports PROFIBUS to Serial Port communication. It is
recommended to use only one serial port (RS232, RS485 or RS422) of the
Gateway at the same time. The following section describes the necessary steps to
be taken to connect one of the three COM port types to a Modbus network.
2.3.1 RS-232 connection
The RS-232 port of the GW-7552 has got three pins. The wiring of the RS-232
device with the RS232 port of the GW-7552 is shown in figure 4.
Figure 4 RS-232 wiring diagram
2.3.2 RS-422 connection
The RS-422 wiring connection is shown in figure 5.
The GW-7552 gateway can be a Modbus master or Modbus slave in a local RS-
422 network. Depending on whether the gateway acts as a Modbus master or as
a Modbus slave and on the number of devices connected to the RS-422 network
device the four jumpers provided by the module has to be set according to table
5. The jumpers set the pull high and pull down resistors for the RS-422 port
(Figure 6, Figure 7).
Figure 5 RS-422 connection
RS-422
GW-7552
RS-422 port
GW-7552
RS-232 COM port
RS-232 device