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Hardware Interface Description
Hardware Requirements
The Vilter 400 Series Compressor uses the on-board COMM 1 port for Modbus RTU communications. The hard-
ware configuration for both protocols is 5-volt RS-485 or RS422 multi-drop.
Interface Connections
Physical interface connections for Modbus communications are made at COMM 1 located on the left side of the
main microprocessor board next to the corner. The following table shows the pin-outs for the Viltech hardware for
COMM 1.
Pin
Name
Function
1
TX+
Transmit Data (Positive)
2
TX-
Transmit Data (Negative)
3
GND
Ground
4
GND
Ground
5
RX-
Receive Data (Negative)
6
RX+
Receive Data (Positive)
NOTE
:
For RS-485 communications, use Terminals 1 and 2 for the network connection and add a
jumper between Terminals 1-6 and 2-5.
The use of low capacitance twisted/shielded cable is required (e.g. Belden #9503 or eq.). The shields should be
grounded at the master computer end of the cable and floated at the microprocessor end.
Figure 1 shows the interface cabling connections for typical Modbus applications. Also shown are the
recommended shield grounding requirements for an in-line data path and a split data path. Other
controllers or PC configurations may be different.
NOTE
:
Since Modbus communications share a port with Viltech communications, The port must be
selected for Modbus operation on the Communications Setup screen.
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