Graphical Digital Panel Meter WPMZ-1 INSTRUCTION MANUAL
17
IM-0882-03
RS-232C
Screwless terminals
No.
Name
Description
28
RXD
Receive data terminal
29
TXD
Transmit data terminal
30
SG
Common terminal for communication function
31 to 34
NC
No connection
*Non-usable for a relay terminal
RS-485 MODBUS RTU
Screwless terminals
No.
Name
Description
28
+
Non-inverting signal
29
-
Inverting signal
30
SG
Signal ground
31
+
Non-inverting signal
32
-
Inverting signal
33,34
TERM
Terminal resistance
（
120Ω
）
terminals
* Short 33 and 34 to be enable the resistance.
* “28 terminal” and “31 terminal” is connected internally and same voltage level.
* “29 terminal” and “32 terminal” is connected internally and same voltage level.
R
X
D
T
X
D
S
G
N
C
N
C
N
C
N
C
34
28 29 30 31 32 33
Suitable wire：AWG24 to 16
＋
RS-485
T
E
R
M
T
E
R
M
S
G
－
＋
RS-485
－
34
28 29 30 31 32 33
* 、 ＆ 、 ：connected internally
28 31
29 32
Suitable wire：AWG24 to 16
