2. CONNECTION
IM9000F02-E2
4
Connecting method
z
When RS-485 is used as a host computer or PLC interface
It is necessary that a circuit to transfer send and receive be built-in the host computer (or PLC).
SG
T/R(B)
T/R(A)
SG
T/R(B)
T/R(A)
RD (RXD)
：
Receive data
SD (TXD)
：
Send data
Host computer or PLC
RS-485
SG
T/R(B)
T/R(A)
y
y
y
Up to 31
Paired wire
Send/receive
selection signal
Twisted pair wire
(with shield)
*R: Use a terminal resistor with a combined resistance of more than 100
:
.
*R
REX-F9000
REX-F9000
SD (TXD) and RD (RXD): Negative logic
7
8
9
7
8
9
z
When RS-232C is used as a host computer or PLC interface
Communication level converter (RS-232C/RS-485) is used.
Communication
level converter
Paired
wire
*R
*R : Use a terminal resistor with a combined resistance of
more than 100
:
.
Twisted pair wire
(with shield)
or
PLC communication
module
Host computer
RS-232C
RS-485
REX-F9000
T/R(B)
SG
T/R(A)
T/R(B)
SG
T/R(A)
7
8
9
When the host computer is for Windows 95/NT, use a communication level converter of
the automatic send/receive select type.
Recommended : CD485, CD485/V manufactured by Data Link, Inc. or equivalent.
CAUTION
