Yaskawa MP920 User's Manual Design - Manual (Page 319)

5 Modules
5.6.2 217 I/F Communications Module (217IF)
5-124
„ RS-485 Port Connection Example
Note: 1. With the CN3 interface, the terminator is enabled by connecting
pins 5 and 6 and pins 1 and 4.
2. Connect the FG of the 217IF CN3 to the FG terminal of the Power
Supply Module using a lead wire.
: 120 Ω terminator
CN2
CN1
RUN
ERR
TRX1
TRX2
TRX3
CN3
217IF
RS232/422
RS-485
MP920
Terminal
(PLC, etc.) Terminal
(PLC, etc.) Terminal
(PLC, etc.) Terminal
(PLC, etc.)
Shield
120 Ω
terminator
The connection when a 217IF
Module is connected in the
middle of the transmission line
is as shown below.
TX/RX TX/RX TX/RX
FG
217IF CN3
FG
TX +
TX -
TXR
RX +
RX -
RXR
SH
7
6
5
2
1
4
3
8
3 6 7 1 2 8
SH TX
(-)
TX
(+) (-) (+)
RX RX SH
217IF CN3
SH
1
1
2
2