Communication Specifications; Communication Connection Terminal; Terminating Resistor (1/2W, 110 Ohms) - YASKAWA V1000 Series Installation & Start-Up Manual

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Communication Specifications

The MEMOBUS/Modbus communication specifications are explained in
Table C.1 MEMOBUS/Modbus Communication Specifications
Item
Interface
Communications Cycle
Communications Parameters
Communications Protocol
Number of Connectable Units
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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
RS-422A
or RS-485
S2 Position
ON
OFF
YASKAWA ELECTRIC TOEP C710606 09B YASKAWA AC Drive V1000 Installation & Start-Up Manual
C.1 MEMOBUS/Modbus Basic Set-Up
RS-422, RS-485
Asynchronous (Start-stop synchronization)
Baud rate:
Data length:
Parity:
Stop bits:
MEMOBUS/Modbus RTU
31 units maximum

Terminating resistor (1/2W, 110 Ohms)

Figure C.2 MEMOBUS/Modbus Switch
Table C.2 MEMOBUS/Modbus Switch Settings
Internal terminal resistance OFF (no terminal resistance); default setting
Specifications
Select from 1200 to 115200 bps.
8 bits fixed
Select from even, odd, or none.
1 bit selected
S+
S-
R+
Switch
R- 1
Description
Internal terminal resistance ON
Table C.1.
+
-
403
C