RKC INSTRUMENT CD101 - 2 Wiring

2. WIRING
IMCD06-E2
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
SD
(
TXD
)
: Send data
Host com
p
uter
RS-485
SG
T/R
(
B
)
T/R
(
A
)



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
Ω
.
*R
Controller
Controller
SD (TXD) and RD (RXD) : Negative logic
 When host computer interface is RS-232C
Communication level converter (RS-232C/RS-485) is used.
Controller
SG
T/R(B)
T/R(A)
RS-485
SG
T/R(A)
T/R(B)
RS-232C
Host computer
Communication level
converter
Twisted pair wire
(with shield)
Paired wire
*R: Use a terminal resistor with a combined resistance of more than 100
Ω
.
*R
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