Connecting Power
The unit can be powered using the AC adaptor or by connecting a power source to the terminal block,
depending on the model. The following instructions are for the AC adaptor:
1. Plug the connector of the power adapter into the DC-IN jack on the back of the unit.
2. Plug the power adapter into an electrical outlet.
3. Follow these instructions to connect a power source to the terminal block:
4. Loosen or remove the screws on the terminal block.
5. Connect the 12~48 VDC power line to the terminal block.
6. Tighten the connections using the screws on the terminal block.
Note that the unit does not have an on/off switch. It automatically turns on when it receives power.
The PWR LED on the top panel will glow to indicate that the unit is receiving power.
For power terminal block pin assignments, please refer to the hardware reference chapter for your
model.
Connecting Serial Devices
The unit’s serial port(s) are located on the back panel. There are two options for connecting serial
devices, depending on the serial interface:
You may use a DB9-to-DB9 cable to connect a serial device to the unit. Plug one end of the
cable into the port on the unit’s back panel and plug the other end of the cable into the device’s
serial port.
You may make your own customized serial cable to connect a serial device to the unit. For the
pin assignments of the unit’s serial port, please refer to Chapter 10. This information can then
be used to construct your own serial cable.
If you are connecting a RS-485 multidrop network with multiple devices, please note the following:
All devices that are connected to a single serial port must use the same protocol (i.e., either
Modbus RTU or Modbus ASCII).
Each master device must get its own port on the unit. If you are connecting a network with
both master and slave devices, the master must be connected on a separate port from the
slaves. Furthermore, the master will only be able to communicate to Modbus TCP slaves, not
to the ASCII or RTU slaves that are connected on a different serial port.
For serial port pin assignments, please refer to the hardware reference chapter for your model.
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