ICP DAS USA GW-7552-B User Manual page 11

Figure 6 Configuration of pull high/low resistor for the RS-422 port
Figure 7 The positions of pull high/low resistors in GW-7552-B / GW-7552-M
module
2.3.3 RS-485 connection
The RS-485 wiring diagram is shown in figure 8.
The GW-7552-B / GW-7552-M gateway can be a Modbus master or Modbus
GW-7552-B / GW-7552-M PROFIBUS/MODBUS GATEWAY User Manual (Version 1.60, May/2017) PAGE: 11