HMR4007

SENSOR PRODUCTS

USING THE HMR4007 IN DIGITAL COMMUNICATIONS MODE

Introduction

The HMR4007 is capable of communicating with a higher-level system through a proprietary communications port (J1). This port uses a bit-clocked serial protocol for higher speed and higher data integrity than standard serial protocols. Signal levels are standard TTL compatible. For convenience, a windows-based DLL (dynamic link library) and sample Visual Basic demonstration program are available from Honeywell that communicates with the sensor through a PC's parallel port. Interested developers should contact their Honeywell representatives or the factory for details of the communications protocol and command structure. The communications port can be used independently or in combination with the analog output described earlier. When used in combination with the analog port, only ONE port should be used to supply power to the board. Sensor configuration, such as changing the magnet mode from axial to radial, is available only through the communications port and DDL calls are supplied to support these basic functions.

Connector J1 General Description

J1 is a 6-pin header which is wired to a PC parallel port for digital communications with the Honeywell demonstration DLL software (or other user application) using the following connections:

PC (parallel port)

 

Sensor Board

 

 

LPT pin

data

J1 pin

function

color

 

direction

 

 

 

15

<--

1

RTS

(gray)

13

<--

2

Data_Out

(yellow)

3

-->

3

Data_In

(blue)

2

-->

4

CTS

(white)

-

<>

5

+5-28 VDC

(red)

19

<>

6

power gnd

(black)

Demonstration Software

Two programs are included with this board to demonstrate its operation.

HMR4007.dll is a dynamic link library that performs low level communications between the host PC's parallel port and the sensor board to query the current, measured position and support operating mode changes. Several functions are visible to the user using the following Visual Basic header formats:

Declare Function InitPort Lib "HMR4007.dll" (ByVal ADD As Integer, ByVal TOut As Long) As Integer Declare Function CurrentPosition Lib "HMR4007.dll" () As Integer

Declare Function SetAxialMode Lib "HMR4007.dll" () As Integer

Declare Function SetRadialMode Lib "HMR4007.dll" () As Integer Declare Function EnableDAC Lib "HMR4007.dll" () As Integer Declare Function DisableDAC Lib "HMR4007.dll" () As Integer

The first function, "InitPort", is used to setup the PC's parallel port base address (default is 0x378) and timeout value. This function must be called before any calls to the operating functions.

The port base address (ADD) is the address of the computer's parallel (printer) adapter and used by the software as a base address to send and receive data to the sensor card through the parallel port adapter. The value is passed as a 16-bit integer. Setting this value to -1 re-initializes the port with the previous value (or default value) retained.

The timeout value (Tout) is used as an internal loop counter to return to the calling program after a fixed time if for some reason the sensor board fails to respond. A value of 10,000 is the default and works well on a 100MHz Pentium-class machine. Higher values will be needed for faster machines. The parameter is passed as a 32-bit long integer. Passing a value of -1 sets the value to the previous (or default) value.

The function returns a 16-bit integer "0" to indicate that the port is active.

Solid State Electronics Center • www.magneticsensors.com • (800) 323-8295 • Page 7

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Honeywell Using the HMR4007 in Digital Communications Mode, Connector J1 General Description, Demonstration Software
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HMR4007 specifications

The Honeywell HMR4007 is an advanced sensor designed for precision measurement in various industrial applications. This device is celebrated for its robust performance and reliability, making it a favored choice among engineers and system designers.

One of the main features of the HMR4007 is its high accuracy in measuring humidity and temperature, providing precise readings essential for maintaining optimal conditions in controlled environments. The sensor operates effectively across a wide temperature range, ensuring versatility for multiple applications. It is designed with a patented sensor technology that enhances its ability to withstand harsh conditions while maintaining accuracy.

In addition to high precision, the HMR4007 boasts a rapid response time, allowing it to quickly adapt to changes in the environment. This responsiveness is crucial in applications requiring real-time monitoring and control, such as in HVAC systems and environmental monitoring.

The device also integrates seamlessly with various communication protocols. This feature enables easy integration into existing systems and enhances its adaptability in different setups. Users can use standard interfaces for simple installation and maintenance, which reduces downtime and enhances operational efficiency.

Another significant characteristic of the Honeywell HMR4007 is its durability. Constructed with high-quality materials, the sensor is built to withstand the rigors of industrial environments, making it a reliable choice for long-term applications. Its rugged design ensures longevity, reducing the need for frequent replacements.

The sensor's compact size makes it suitable for applications with limited space, while its lightweight design ensures easy installation. Furthermore, the HMR4007 is designed for low power consumption, making it cost-effective in the long run.

In summary, the Honeywell HMR4007 stands out due to its high accuracy, rapid response time, flexible communication options, and robust durability. These features make it an ideal sensor for a variety of industries looking to maintain precise environmental conditions. Its advanced technology and reliability ensure that it meets the demanding needs of modern industrial applications, positioning it as a valuable tool for professionals in the field.
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