Zenner multidata WR3 - Connector Pin Assignment

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2 4
1 2 3 4 10 11 9 50 51 52 53 54 55 71 72 73 74
2 4
1 2 3 4 10 11 9 50 51 52 53 54 55 71 72 73 74
Switch for 2-wire measure-
ment (le position) and 4-wire
measurement (right position)
Connection 2-wire
Connection 4-wire
Depending on the meter’s model the version of the connection board
can dier. If water meters with a potential free reed contact are con-
nected to the inputs the connection can be made in any direction. Take
care of the polarity when connecting to a BMS. The connectors 24/25 are
given twice for the incoming and outgoing of the M-Bus wire.
Temperature sensor
2-wire measurement: 4-wire measurement (optionally):
Supply: 1 - 2 Supply: 1 – 2 / 5 – 6
Return: 3 - 4 Return: 3 – 4 / 7 – 8
Flow sensor
Pulse: 10
GND: 11
Inputs/Outputs
I/O 1: Pulse: 52 I/O 2: Pulse: 54
GND: 53 GND: 55
M-Bus RS-232 RS-485
L1: 24 DTR: 71 +UB: 71
L2: 25 GND: 72 GND: 72
Tx: 73 A: 73
Rx: 74 B: 74
Connector pin assignment
Important note for pure cooling meter calculators (only valid for Germany):
The temperature sensor on terminal 1/2 (or 1/2 and 5/6) must be installed in the
cold ow, the temperature sensor on terminal 3/4 (or 3/4 and 7/8) in the cold re-
turn. The display for the temperature dierence on the display (see page 26) must
have a negative sign when the system is running normally.