- 3 -
Connection Method
The following Figures show how to connect the instrument, a USB-RS485 Converter
and a PC. For more details, refer to the information accompanied with USB-RS485
Converter MODEL, 3716A-20 (with a Converter Connecting Cable, MODEL 3716A-21).
・
USB-RS485 Converter Model
：
USB-4W485-RJ45-T9P
Manufacturer: System Sacom Industry Corp.
Connection Method of the Converter Connecting Cable and USB-RS485 Converter
Number
Signal name
(this instrument)
Number
RS485
Converter
1
TXD+
4
RXD+
2
TXD-
5
RXD-
3
RXD+
1
TXD+
4
RXD-
2
TXD-
5
GND
3
GND
6
GND
6
GND
7
+24V input
7
NC
8
+24V input
8
NC
Case
Shield
9
NC
USB-4W485-RJ45-T9P
Converter Cable 3716A-21
Note: To supply power through the converter connecting cable, supply 9-28V
to +24V and GND.
When power is supplied through the provided AC adapter and analog output
terminal, do not connect to the converter. In this case, the terminal not in
use should be insulated.
USB-RS485 Converter
（
MODEL 3716A-20
）
USB-4W485-RJ45-T9P
(System Sacom Industry Corp.)
PC
Converter Connecting Cable
（
MODEL 3716A-21
）
USB Cable
(Accessory of MODEL 3716A-20
）
8
7
6
5
4
3
2
1
P
ow
er
(9
-2
8V
)
0
.5
μ
m
5
.0
μ
m
A
-G
ND
P
-G
ND
A
LM
.c
h1
A
LM
.c
h2
A
LM
.C
OM
R
S-
4
85
D
C
-I
N