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E-m-hf5-v2_12 – ROTRONIC HF5 User Manual

Page 22

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E-M-HF5-V2_12

Rotronic AG
Bassersdorf, Switzerland

Document code

Unit

HygroFlex HF5 Humidity Temperature
Transmitters: User Guide

Instruction Manual

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Page

22 of 36

Document title

© 2009-2013; Rotronic AG E-M-HF5-V2_12

6.4.4

HF556: digital output


Connectors and terminal block diagram













Notes:

Terminal K1-3
: this terminal (protective or earth ground) is not tied with GND. If so desired, K1-3 can be tied
with GND by closing a solder pad on the PCB (B18)

Terminal block K3 (RS-485): terminals K3-1 and K3-2 can be used to power the HF55 from a 15 to 24 VDC
power supply connected to the RS-485 main data line. In this case, do not use terminals K1-1 and pin K1-2
(normally used to power the HF55).

WARNING: Connecting a device to an active Ethernet network can disrupt communications on the network.
Before connecting the HF5, make sure that it is properly configured for your network.

Terminals

Description

K1-1: GND

Power supply (-) or neutral
(tied with other GND)

K1-2: V+

Power supply: 5…40 VDC (+)
or 12…28 VAC (Phase)

K1-3: -

Protective ground (see note below)

Terminals

Description

K3-4: D-

RS-485 Bi-directional
TX- / RX -

K3-3: D+

RS-485 Bi-directional
TX+ / RX +

K3-2: GND

Ground / Power supply (-)
(tied with other GND)

K3-1: PWR

DC (+) 15…24 VDC (+)
(optional, see note below)