FUTEK IPM600 (D610) Digital Display User Manual

Page 109

15.RS-485 COMMUNICATION INTERFACE(OPTION)

2-wire connection

Set the communications mode of the F371 to “2-wire.”

First, connect “A-” of “RD” and “SD”, and “B+” of “RD” and “SD” of the F371.

Next, connect the target equipment with the same polarity. (See "2. Polarity")

2. Polarity

Basically, connect “A” or “-” of the equipment on the other end to “A-” of the F371, and

“B” or “+” of the equipment on the other end to “B+” of the F371.

(In some rare cases, the signal polarity (A/B notation) may be reversed, so that

communications cannot be made even with correct connection. In such cases, connect by

reversing the signal polarity.)

3. Terminal resistor

Mount a terminal resistor of approx. 100 – 200

on the receiving side.

(The F371 can also be set to connect 120

internally.)

In the case of 2-wire, it should be connected to both ends because the sending and

receiving signal lines are the same. (See the connection diagram.)

4. SG terminal

This is the ground for signal lines. When connecting to the SG terminal of the equipment

on the other end, connect after checking the specifications of the equipment on the other

end.

F371

Master

F371