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Graphical Digital Panel Meter WPMZ-3 INSTRUCTION MANUAL
20
IM-0883-01
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