MGP WRM2 Manual de usuario descargar pdf (Pagina 25)

15-00043

Revision 3

September 2005

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2.4.2 Operation

The WRM-2 EXT is a compact unit used to transmit and/or receive serial data in TTL or standard

RS-232 from HP instruments to a WRM-2 Base and Repeaters.

Because of the open and flexible protocol used by the WRM-2 EXT, any device with RS-232

capability could be connected to the WRM-2 System like body temperature or heart rate sensors,

GPS monitors, and chemical or biological detection systems. In this case the software receiving the

data from the base station must be designed to properly identify and display this data.

The WRM-2 EXT can work on a request mode (strobe the device for data request) or in a

continuous mode where the device accepts asynchronous data going into the EXT serial input and it

gets immediately transmitted over the air to a base and/or repeater in the same frequency and

channel number.

Normally the EXT outputs 5.0 VDC on pin 1 of the RJ-22 to power the DMC-family of dosimeters.

The EXT board can be set-up internally (via dip switches) to change the function of pin 1 to

standard RS-232 input.

An adapter cable from RJ-22 to DB-9M/F is available to connect to standard RS-232 devices.

Up to 75 WRM-2 EXT connected to WRM compatible devices can be active on a single network at

4 second transmission interval with no loss contacts when the loss contact timer is set to 30

seconds. Higher numbers are possible if longer transmission intervals are selected. If other

devices with longer data packets are used, the maximum number must be recalculated.

The range of the unit is the same as the one for the repeater and PAM-TRX. For very long range

coverage MGPI recommends the use of MESH Repeaters or high gain directional antennas.

Figure 16, below, is an image of the top panel and battery compartment of the EXT.

Figure 16: EXT Top Panel and Battery Compartment

9 Volt

Cell

Battery

Compartment

Cover

ON/OFF

Switch

External

Powe

LED

Indicato

RPSMA

Antenna

Connector

RJ-22

Jack

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 39 40

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MGP WRM2 Manual de usuario Pagina 25

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