User guide

3-5
M-4662
UsingtheSerialInterface
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2
3
4
5
6
7
App
Index
RS-422/485ConnectionProcedure
TerminalArrangementandSignalNames
Connect a cable to the clamp terminal.
(Rear panel)
FG SDB RDB
SG SDA RDA
Terminal assignments are shown in the table below.
SignalName SignalDescription
FG (Frame Ground) The MV case ground.
SG (Signal Ground) Signal ground.
SDB (Send Data B) Send data B (+).
SDA (Send Data A) Send data A (–).
RDB (Received Data B) Receive data B (+).
RDA (Received Data A) Receive data A (–).
Connection
• Connecting a cable
As shown in the figure below, remove approximately 5 mm of the covering from the
end of the cable to expose the conductor. Keep the exposed section from the end of
the shield within 5 cm.
• Connection for a four-wire system
RDB
RDASDA
SDB
SG
FG
Shield potential
Shield
ConnectingtoaHostDevice
The figure below illustrates the connection of the MV to a host device. If the port on the
host device is RS-232, connect a converter.
RS-422/485 port
on the MV
Host computer or
host device
Host device side
Converter
RS-422/485
RS-422/485 port
on the MV
Host computer
RS-232
RS-422/485
Host device side
3.2 Connecting the MV