Emerson Micro Motion LF Series, Installation Manual

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50 LF-Series Flowmeters: Sensor/Transmitter Installation
I/O Wiring – DIN AN Transmitters
Figure 9-5 Frequency output wiring – Output voltage versus load resistance
9.2.3 Wiring to a remote host
Terminals 33 and 34 support Modbus/RS-485 communication with a remote host. For an example of
wiring, see Figure 9-6. For terminal information, see Table 9-2.
Figure 9-6 Wiring to a remote host
Open circuit output voltage = 15 VDC ±3%
High le
vel out
put
v
o
lta
g
e (v
olts)
0 1000 2000 3000 4000 5000
Load resistance (ohms)
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
RS-485/B
RS-485/A
Remote host