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HMDW110 User Guide
3.5.3 Wiring HMDW110 With RDP100 Remote Display Panel
HMDW110
8 T -
7 T+
6 HUM-
5 HUM+
4 Pwr+
3 Pwr -
2 RS485 -
1 RS485+
Figure 11 HMDW110 Wiring With RDP100 Remote Display Panel
You must always connect the humidity measurement current loop (HUM, terminals 5 and 6) to
power the transmitter. Connecting the temperature measurement current loop (terminals 7
and 8) is optional.
Connect the RDP100 remote display panel using terminals 1 ... 4. The HMDW110 series
transmitter provides both power and data to the RDP100.
Terminals 1 ... 4 shall be used only for connecting the RDP100 (optional) when
using the analog outputs. If the RDP100 is not used, terminals 1 ... 4 must be left
unconnected. Otherwise the analog outputs may output incorrect readings.
The GND input of the RDP100 must be connected only to terminal 3 of the
HMDW110 transmitter. It must not be connected to any local ground potential.
26
2 x 4 ... 20 mA
R
= 0 ... 600 Ω
L
A
A
M211726EN-D
Power supply
-
+
10 ... 28 VDC
-
Power supply
+
10 ... 28 VDC
RDP100
PWR+
GND
RS485+
RS485-
GND
ExtPWR+
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