Figure 23: ethernet module, Com4 – SATEC EM920 Installation Manual User Manual
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Chapter 2 Installation
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Figure 23: ETHERNET module
RS-485/232 Communication port (COM4 – ETH optional module)
The RS-485/232 Communication port – COM4 is provided by ETH optional module.
Each module with Communication port – COM4, provides two
indication GREEN LEDS:
"RX" GREEN LED, blinking led shows receiving data at COM4
"TX" GREEN LED, blinking led shows sending data at COM4
RS-485 mode
In the RS-485 mode, the 485/232 wire must be left opened as shown in figure 24
Figure 24: Serial Communication Network Connection – RS-485 COM4