Yaskawa Sigma II Indexer - Manual (Page 43)

Sigma II Indexer User’s Manual Serial Communication Connectors (CN6, CN7)
3-16
RS422/485 Interface Cable
1. Make sure that the drive system, control system, power system, and other transmission
systems are separate from each other (i.e., do not run the power wire with the control
wire).
2. The RS422/485 cable length is 50 m maximum. Use the minimum length necessary.
3. The Sigma II Indexer module RS422/485 interface is a non-isolated system. Errors
may occur from noise in the connected terminal. If noise occurs use a shield-type cable
and/or ferrite core to reduce the noise.
4. In the case of RS422, insert a terminating resistor (100
Ω) as needed. Make the termi-
nation on the PC side receiving line. Short pins 6 and 7 only on the last axis.
5. In the case of RS485, attach a terminating resistor (100
Ω) to the PC side transmission
line. Short pins 6 and 7 only on the last axis.
6. If noise persists in the case of RS422 or RS485, it may be necessary to add pull-up/
pull-down resistors as shown in Fig. 3.5 and 3.6.