Teledyne Marine Instruments 2002 Manuel d'utilisateur télécharger pdf (Page 23)

149-072011 Model 2002 Vacuum Gauge Page 23 of 38

6. Communications Option Board

Both RS-232 and RS-485 communication interface boards are available as an option for the Model 2002.

The communication option boards allow data to be output to a host computer with the appropriate interface.

Connection to the RS-232 or RS-485 communication interface boards are via a 9 pin D-subminiature female

connector.

6.1. RS-232-E Interface Specifications

Format.................................................... EIA standard RS-232-E, full-duplex, no handshaking, asynchronous

Data Rate ...........................................................................................................................................9600 baud

Character Length ......................................................................................................................... Eight data bits

Parity ....................................................................................................................................................No parity

Stop bits .......................................................................................................................................... One stop bit

A common application of the RS232 version of the HPM-2002, is to connect the pressure gauge directly to

the serial port of a PC. This is done by first wiring a communication cable in the manner shown below.

PIN MNEMONIC SIGNAL DESCRIPTION

2 TX Transmit Data Transmits data within RS-232-E voltage levels

3 RX Receive Data Accepts data within RS-232-E voltage levels

5 SG Signal Ground

Establishes the comm on ground reference

potential for all interchange circuits

when

232-E.

Communicating via RS-232-e

4CTSClear to Send

Host co mputer re ady to accept data.

(Reserved for future use, no t implem ented

by present software.

8RDY Ready

Ready to receive data (always high,

not implemented by present software).

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Teledyne Marine Instruments 2002 Manuel d'utilisateur Page 23

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