Yaskawa MP920 Communications Module - Manual (Page 127)

6.4 Cables
6-11
6
6.4.2 RS-422/485 Interface Cables
• The power system, control system, and electrical system, as well as the transmission system, must
be wired separately.
• The RS-422/485 interface of the 217IF Module is an MR-8-pin connector (CN3).
• The maximum length of the RS-422/485 cable is 300 meters. This cable should be as short as pos-
sible.
• The RS-422/485 interface of the 217IF Module is not isolated. A malfunction may sometimes
occur, due to noise from the connected terminals. If noise is a problem, use a shielded cable or a
modem to reduce the noise.
• With the RS-422, insert terminating resistances as required. Be sure to insert terminating resis-
tance at the ends of the line.
• With the RS-485, use terminating resistances at both end stations of the transmission line.
Table 6.5 217IF RS-232C Transmission Line Connections
MP920 217IF (CN1, CN2) Cable Connection and Signal
Direction
Remote Station
(D-sub 9-pin)
(Yaskawa Specifications)
Signal Name Pin No. Pin No. Signal Name
FG 1 1 FG
SD (TXD) 2 2 SD (TXD)
RD (RXD) 3 3 RD (RXD)
RS 4 4 RS
CS (CTS) 5 5 CS (CTS)
DR (DSR) 6 6 DR (DSR)
SG 7 7 SG
CD 8 8 CD
ER (DTR) 9 9 ER (DTR)
MP920 217IF (CN1) Cable Connection and Signal
Direction
PC/AT Compatible Personal
Computer
Signal Name Pin No. Pin No. Signal Name
FG 1 1 FG
SD (TXD) 2 2 SD (TXD)
RD (RXD) 3 3 RD (RXD)
RS 4 4 RS
CS (CTS) 5 5 CS (CTS)
DR (DSR) 6 6 DR (DSR)
SG 7 7 SG
CD 8 8 CD
ER (DTR) 9 9 ER (DTR)
IMPORTANT