ROTRONIC HF7 - Manual (Page 17)

E-M-HF7-V1_24
Rotronic AG
Bassersdorf, Switzerland
Document code Unit
HygroFlex HF7 Humidity Temperature
Transmitters: User Guide Instruction Manual
Document Type
Page 17 of 23
Document title
© 2009-2011; Rotronic AG E-M-HF7-V1_24
8 Maintenance
8.1 Service cable
IMPORTANT:
o Use service cable AC3009 with all 2-wire, loop powered transmitters. This cable powers up the
transmitter via the service connector. Do not use any other method for powering the transmitter when
using this cable AC3009 as this will create a ground loop and damage the transmitter. For the same
reasons do not use cable AC3006 with a 2-wire, loop powered transmitter.
o Use service cable AC3006 with all 3-wire transmitters as well as with digital models. This cable does
not provide power to the transmitter and the transmitter should powered separately when using this
cable
Both cables AC3006 and AC3009 convert UART (service connector) to USB and are used to connect the
transmitter to a USB port of a PC running the ROTRONIC HW4 software. Prior to using any of these
cables, the ROTRONIC USB driver must be installed on the PC. Both the driver and the installation
instructions (document E-M-HW4v3-Main) are located on the HW4 CD.
As an alternative, cable AC2001 is used to connect the HF7 to a probe input of the HP23 hand-held
calibrator. For service purposes, the HP23 offers essentially the same functionality as the HW4 software.
8.2 Location of the service connector (mini USB type)
WARNING: the service connector is a UART interface with a mini-USB connector type. Do not connect the
service connector directly to the USB port of a PC or hub.
The service connector is located on the HF7 printed
circuit board and can be accessed after removing the
enclosure cover.
Service
Connector
(Mini USB)