Linksys HM-BT-VIN User Manual
ProComSol, Ltd HM-BT-VIN User Manual
HM-BT-VIN User Manual
Introduction
The HM-BT-VIN HART Modem, Bluetooth is designed to connect PC’s to HART
networks via wireless Bluetooth technology. The explosion proof enclosure allows the
unit to be mounted permanently in the plant. The user’s application software can then
configure, monitor, and document HART based instrumentation from up to 300ft (100m)
away without opening HART instrument covers.
System Diagram
The complete system consists of Host PC with Bluetooth transmitter, HM-BT-VIN,
Power Supply, and HART network. The Host PC can be a Pocket PC PDA. For PC’s
without an integral Bluetooth transmitter, there are many add-on transmitter modules
available, such as the Linksys USBBT100, USB Bluetooth Adapter.
Figure 1. Typical Bluetooth System Diagram
Bluetooth Range
Note that Class 1 Bluetooth transmitters, such as the USBBT100 have a range of 300’.
Class 2 transmitters, such as the HP IPAQ PDA, have a range of 25’. The HM-BT-VIN
works with both Class 1 and Class 2 transmitters, but operation is limited to the range of
the master transmitter.
Software Drivers
No additional software drivers need to be installed.
Power
An external power supply must be connected to the HM-BT-VIN. The supply can be
12Vdc to 36Vdc, with a minimum current of 500mA.
Under some special conditions, the same supply for the Loop can be used to power the
HM-BT-VIN. Contact ProComSol, Ltd for details.
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ProComSol, Ltd HM-BT-VIN User Manual
Power Connection:
J1-1 – V+
J1-2 – V-
Reset Switch
A reset switch is provided on the front panel to reset the HM-BT-VIN without having to
remove power. This switch is useful for troubleshooting any communication problems.
It is not needed for normal use.
Press and hold the switch for 5 seconds to perform a reset.
Power LED
When the unit is powered, the Red LED will be on.
Bluetooth Activity LED
This Blue LED will flicker when the Bluetooth connection is open. The LED will be
solid on when successfully linked to a Bluetooth transmitter. Under normal HART
communication conditions, the LED will be solid on.
HART Connections
There are several ways to make the HART connection. Your specific situation will
determine the best connection method to use to reduce installation time.
Standard HART Connection
The front panel terminals J1-3 and J1-4 are the HART connections. The modem can be
connected in one of two ways: across the loop load resistor (A – B) or across the HART
transmitter terminals (C – D). See Figure 2.
Figure 2. Standard HART Connections
1. Across the Loop Resistor
J1-3 to A
J1-4 to B
2. Or, to the HART transmitter
J1-3 to C
J1-4 to D
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ProComSol, Ltd HM-BT-VIN User Manual
Reduced Wiring Feature
Terminals J1-5 and J1-6 can be used to reduce wiring to make installation easier.
Internally, J1-5 is connected to J1-3, and J1-6 is connected to J1-4. This can reduce
wiring in two ways. See Figures 3 and 4.
Figure 3. Reduced HART Wiring
Figure 4. Loop Resistor in HM-BT-VIN
The loop resistor in Figure 4 must be supplied by the user.
Initial PC Setup/ Bluetooth Modem Discovery
The following procedure must be done at least once for the PC to “Discover” the HMBT-VIN.
1. Apply power to the HM-BT-VIN. It does not need to be connected to the HART
network.
2. Run the Bluetooth driver software that came with your PC or Bluetooth adapter
(ie Linksys). There is typically a Bluetooth icon on the system tray that can be
double clicked.
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