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3.3 RS-422-A/485 Interface Pin Arrangement and Signal Names and the Connection Procedure
Connection Example with the Host Computer
The instrument can be connected to a host computer that has an RS-232, RS-422A, or
RS-485 port.
• For RS-232, use the converter.
• For recommended converters, see the latter section “Serial Interface converter.”
• The two-wire cable can be used only when using the Modbus protocol. For the
configuration procedure, see section 3.5, “Configuring the Serial Interface.”
Four-wire system
In general, the instrument and the host computer are connected using a four-wire
cable. For the four-wire system, the transmission and reception lines must be
crossed.
Host
computer
Terminator (externally attached) 120 Ω, 1/2 W or more
Terminator (externally attached)
RS-422A/485
pins on the MV
SD A
SDA( – )
(SDA)
SDB( + )
(SDB)
SD A
SD B
RDA( – )
(RD A)
(RD B)
SG
(SG)
(SDA)
SD B
SD B
(SDB)
RD A
RDB( + )
SD A
(SDA)
(SDB)
RD A
(RD A)
RD B
RD A
(RD A)
RD B
(RD B)
SG
RD B
(RD B)
SG
SG
(SG)
FG
(SG)
FG
#1
FG
#2
#n
(#n ≤ 32)
Do not connect terminator to #1 to #n–1
(The following diagram illustrates the case when the host computer's interface
is RS-232)
Host
computer
Terminator (externally attached) 120 Ω, 1/2 W or more
RS-232
TD( – )
RS-422A/485
pins on the MV
SD A
(SDA)
(SDB)
RD( – )
(RD A)
RD( + )
(RD B)
SD A
(SDA)
SD B
SD B
(SDB)
RD A
(SDB)
RD A
(RD A)
RD B
(SG)
RD A
(RD A)
RD B
(RD B)
SG
RD B
(RD B)
SG
(SG)
FG
Converter
SD A
(SDA)
SD B
TD( + )
SHIELD
Terminator (externally attached)
#1
SG
(SG)
FG
#2
FG
#n
(#n ≤ 32)
Do not connect terminator to #1 to #n–1
3-6
IM MV100-17E