RKC INSTRUMENT CB100 - RS-485 Interface Wiring; RS-232 C Interface Wiring

2. WIRING
IMCB03-E4
3
 When host computer interface is RS-485
It is necessary that a circuit to transfer send and receive be built-in the host computer.
SG
T/R
(
B
)
T/R
(
A
)
SG
T/R
(
B
)
T/R
(
A
)
RD (RXD)
：
Receive data
SD
(
TXD
)
：
Send data
Host com
p
uter
RS-485
SG
T/R
(
B
)
T/R
(
A
)



U
p
to 31
Paired wire
Send/receive
selection signal
Twisted pair wire
(with shield)
*R: Termination resistors (Example: 120
Ω
1/2 W)
*R
Controller
Controller
SD (TXD) and RD (RXD): Negative logic
*R
 When host computer interface is RS-232C
RS-232C/RS-485 converter is required.
Controller
SG
T/R(B)
T/R(A)
RS-485
SG
T/R(A)
T/R(B)
RS-232C
Host computer
RS-232C/RS-485
converter
Twisted pair wire
(with shield)
Paired wire
*R: Termination resistors (Example: 120
Ω
1/2 W)
*R *R
When the host computer use Windows 95/98/NT, use a RS-232C/RS-485 converter with an
automatic send/receive transfer function.
Recommended: CD485, CD485/V manufactured by Data Link, Inc. or equivalent.
CAUTION