ProComSol HM-USB-PWR Operating Manual

HM-USB-PWR User Manual

HM-USB-PWR User Manual

Introduction

The HM-USB-PWR HART® Modem is designed to connect PC’s to HART networks.
Application software can then configure, monitor, and document HART based
instrumentation. The power supply feature can also power HART transmitters.

Software Drivers

Before use, a USB Virtual Serial Port must be installed on the PC. Insert the enclosed
CD into your PC. The USB Virtual Serial Port driver should install automatically. Once
the driver is installed, you can connect the HM-USB-PWR to the USB port on your PC.

Windows

After the HM-USB-PWR is connected and the New Hardware Found wizard is finished,
the following will appear at the bottom of the screen:

Note: A completion message may not appear on some system.

COM Port Assignment

After installing, and with the HM-USB-PWR still connected to the PC, go to Start ->
Settings -> Control Panel -> System -> Hardware -> Device Manager -> Ports, to see
what COM port number was assigned to the modem by the Windows operating system.
The port labeled “USB Serial Port” is the assigned port.

Alternatively, if you click on the “Your devices are ready to use” message, the assigned
COM port will be listed.

This port assignment can be changed by the user. From the “Device Manager” menu,
select the USB Serial Port you wish to change. From the “Properties” page, select “Port
Settings”. Then select “Advanced”. The COM port can be set in the range 1-256.

Operating Modes

Three different operating modes are available - Power + Modem
Modem Only, and Power Only. Each requires different cable setups.

Power + Modem

Connect the supplied HART cable to the “Modem + Power” connector on the HM-USB­PWR. The 24Vdc LED should illuminate.

Connect the Red connector to the positive (+) terminal of the HART Transmitter.
Connect the Black connector to the negative (-) terminal of the HART transmitter. The

MAN-1044 6/15/2017 Our Quality Management System is Page 1

ISO 9001:2008 Certified

HM-USB-PWR User Manual

HART Loop resistor is built-in to the modem so an external resistor is not required for
this mode.

Modem Only

Connect the supplied HART cable to the “Modem Only” connector on the HM-USB­PWR. The 24Vdc LED should be off.

Connect the Red connector to the positive (+) terminal of the HART Transmitter.
Connect the Black connector to the negative (-) terminal of the HART transmitter. Note
that the HART transmitter requires an external power supply and loop resistor in this
mode.

This mode is useful for communicating with WirelessHART devices that are battery
powered.

Power Only

Connect the supplied HART cable to the “Modem + Power” connector on the HM-USB­PWR. The 24Vdc LED should illuminate.

Connect the Red connector to the positive (+) terminal of the HART Transmitter.
Connect the Black connector to the negative (-) terminal of the HART transmitter. The
HART transmitter is now powered. The HART Loop resistor is built-in to the modem so
an external resistor is not required for this mode when using an external HART modem.

Current Measurement

You can measure the loop current without breaking the loop. Simply connect your
current meter to the “Current” test points on the HM-USB-PWR.

External HART Modem Option

With the HM-USB-PWR operating in the Power Only mode, an external HART modem
or HART Communicator can be connected to the “HART” test points. The loop resistor
is built-in so no external loop resistor is necessary.

HART and Power Connections

Simply connect the modem to the HART transmitter observing power polarity. See
Figure 1.

Figure 1. HART and Power Connections

USB Connection

Connect the integral USB-A connector to any available USB port on your PC.

MAN-1044 6/15/2017 Our Quality Management System is Page 2

ISO 9001:2008 Certified