Martel Electronics BetaGauge 321A - Manual (Page 28)

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12. Remote Operation
12.1 Remote Interface
The calibrator can be remotely controlled using a PC terminal, or by a computer program
running the calibrator in an automated system. It uses an RS-232 serial port connection
for remote operation. NOTE: To use the remote control option a custom RS-232
cable must be purchased from Martel (LEM232). To contact Martel refer to
Section 1.1 of this manual. With this connection the user can write programs on the
PC, with Windows languages like Visual Basic to operate the calibrator, or use a Windows
terminal, such as Hyper Terminal, to enter single commands. Typical RS-232 remote
configurations are shown in Figure 13.
Figure 13. Calibrator-to-Computer Connection
12.2 Setting up the RS-232 Port for Remote Control
Note: The RS-232 connection cable should not exceed 15m unless the load capacitance
measured at connection points is less than 2500pF.
Serial parameter values:
9600 baud
8 data bits
1 stop bit
no parity
Xon/Xoff
EOL (End of Line) character or CR (Carriage Return) or both
The LEM232 cable is used for RS-232 communications from the calibrator to a computer.
If the computer only has USB type ports, a USB to RS-232 converter will be needed.
These can be obtained from most office supply and computer stores. To connect the
calibrator to the computer, attach the LEMO connector end of the cable to the pressure