C.1 MEMOBUS/Modbus Basic Set-Up
YASKAWA TM.V1000.01 V1000 Drive Installation & Start-Up Manual (Preliminary 01-19-07) 429
Network
Communications
C
◆ Communication Specifications
The MEMOBUS/Modbus communication specifications are explained in
Table C. 1 .
Table C.1 MEMOBUS/Modbus Communication Specifications
◆ Communication Connection Terminal
MEMOBUS/Modbus communication uses the following terminals: S+, S-, R+, and
R-. The terminating resistor must be turned ON only if the Drive is at the very end
of the serial communication chain. Set the terminating resistor by turning ON pin 1
of switch S2.
Figure C.2
Figure C.2 MEMOBUS/Modbus Switch
Item Specifications
Interface RS-422, RS-485
Communications Cycle Asynchronous (Start-stop synchronization)
Communications Parameters
Baud rate: Select from 1200 to 115200 bps.
Data length: 8 bits fixed
Parity: Select from even, odd, or none.
Stop bits: 1 bit selected
Communications Protocol MEMOBUS/Modbus RTU
Number of Connectable Units 31 units maximum
Terminating resistor (1/2W, 110 Ohms)
RS-422A
or RS-485
Switch
S+
S-
R+
R-
+
-
1
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