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Model 2002 Vacuum Gauge Page 22 of 37
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 common ground reference
potential for all interchange circuits
when
232-E.
Communicating via RS-232-e
4CTSClear to Send
Host computer ready to accept data.
(Reserved for future use, not implem ented
by present software.
8RDY Ready
Ready to receive data (always high,
not implemented by present software).