Oldham MX 32 - RS485 Digital Output and Communication

12 – RS485 Digital Output
55
Chapter 12 | RS485 Digital Output
The MX 32 units using the RS485 Modbus option are equipped with a
communication card (code 6451680), which is affixed to the motherboard.
This card generates a RS485 output in Modbus RTU format.
Card description
Figure 41: RS485 card
Rep.
Function
A.
Operating LEDs. The Rx LED lights up when a data thread is
received. The Tx LED indicates that the card has power and turns
off when data is being transmitted out.
B.
Connection terminal:
A = Tx or +RS485
B = Rx or –RS485
C.
End Of Line (EOL) resistance. Set the switch to the EOL position for
the unit that is the last module in the RS485 network. For other
units, set the switch to NO EOL.
The RS485 output can be configured using the COM 32 software, or using
unit menu 2.4 Program >RS485 Port (see page 36).