C.4 Connecting to a Network n RS-422 Interface Drive SI-485/J PLC Terminating Register S2 OFF Drive SI-485/J Terminating Register S2 OFF SI-485/J Drive S2 Terminating Register ON Figure C.4 RS-422 Interface Note: • Turn on the DIP switch at the SI-485/J that is located at the end of the network. Turn it off at all other slaves. • Set H5-07 to “0” when using the RS-485 interface. u Network Termination The two ends of the MEMOBUS/Modbus network line have to be terminated. The Interface for MEMOBUS/Modbus Communication (SI-485/J) has a built in terminating resistance that can be enabled or disabled using DIP switch S2.
If a drive is located at the end of a network line, enable the terminating resistance by setting DIP switch S2 to the ON position. Disable the terminating resistance on all slaves that are not located at the network line end. Figure C.5 llustrates the setting of DIP switch S2. S+ + DIP switch S2 S - - RS-422 or RS-485 R+ DIP switch R - S2 terminal resistance (1/2 W, 110 ) Figure C.5 Serial Communications Terminal and DIP Switch S2 190 SIEP C710606 33A OYMC AC Drive – J1000 User Manual S+ R+ S– R– IG I G R+ S+ R– S– R+ R– I G S+ S– R+ R– I G S+ S– (in the ON position) OFF ON