Omron SYSDRIVE 3G3MV

7-38
D RS-422 (4-wire)
Communications Board
RS-422/485
Interface
Code Pin No.
Frame
9-pin, D-sub connector
(Cable side: Male)
3G3MV
Code
3G3MV
Code
Control
circuit termi-
nal block
(commu-
nications
terminals)
Control
circuit ter-
minal block
(commu-
nications
terminals)
B500-AL001 Link Adapter
Pin No.
Code
RS-422
Interface
Code
Pin No.
Shielded line
Shielded line
Shielded line
Code
Pin No.
Note Turn the terminal resistance of all the Inverters to ON for RS-422 communica-
tions. Refer to page 2-18, Selecting RS-422/485 Termination Resistance for
details.
7-9-3 Outline of Protocol Macro Function
H Protocol Macro Function
·The protocol macro function makes it possible to customize a communications proto-
col in order to createamacroaccording to the specificationsof theserial communica-
tions port of the general-purpose peripheral device.
·The protocol macro function is mainly used for the following jobs.
Creation of message communications frame.
Creation of Send & Recv procedures for message communications frame.
Note Thismanualusestheterms“message,DSRmessage,andresponse”toexpress
the communications data exchanged.
S Message: A DSR message or response.
S DSR Message: A message sent by the Master for instructions to the Inverter.
S Response:AmessagethattheInverterreturnsincompliancewithaDSRmessage
from the Master.
D Creating a Message
·The message can be created according to the communications specifications of the
general-purpose peripheral device (Inverter) as a counterpart.
Communications Chapter 7