MGP WRM2 Manual de usuario descargar pdf (Pagina 34)

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Revision 3

September 2005

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APPENDIX 1

Dosimeter Data Protocol

This document describes the data exchange protocol used between a DMC series dosimeter in 4800 BAUD

and a PAM-TRX sent to a Base or Repeater.

Dosimeter Settings

The correct dosimeter settings for the dosimeter are as follows:

Status word 5 (accessible from Message 11)

Bit 0 set to 1 tele-transmission allowed

Bit 2 set to 1 transmit on request mode

Bit 3 Set to 1 transmit in 4800 BAUD (DMC-2000 only)

This means that the dosimeter transmits data immediately following a strobe signal and the data is

transmitted using the dosimeter internal clock in ASCII format, 8 bits with bit 8 set to 0, and 1 stop bit.

Figure A1 below depicts a timing diagram of the data stream.

Signal Out bo b1 b2 b3 b4 b5 b6 b7

LSB MSB

START STOP

Figure A1-1: Data Stream Timing Diagram

The ASCII format of the data is as shown in Table 1 below. The dosimeter data consists of 13 characters,

each consisting of two bytes representing an ASCII character or a set of 4 status bits. The data starts with a

Line Feed (LF) and ends with a checksum CKS. A Carriage Return (CR) is transmitted after the checksum.

The data sent is:

• Dosimeter serial number

• Cumulated Dose

• Current value of the Dose Rate

• Dosimeter Status

The check sum is calculated such that the modulo 256 sum of all 26 bytes is equal to 0.

1 2 ... 29 30 31 32 33 34 35 36 37 38 39 40

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MGP WRM2 Manual de usuario Pagina 34