2 - Introduction to Programming

RS-232 Programming Example

The following program illustrates how to program the ac source using RS-232 to set the output voltage and frequency and to read back the model number and output voltage. The program was written to run on any controller using Microsoft QBasic.

NOTE: The ac source must be configured for RS232 and the same baud rate and parity as the controller.

‘Program to write and read via RS232

‘Configure serial port for:

‘9600 baud

‘7 bit data

‘2 stop bits

‘Ignore request to send

‘Ignore carrier detect

‘ Even parity

‘ Needed with Vectra basic, ignored with QBasic

‘Send line feed

‘Reserve 1000 character buffer for serial I/O

DECLARE FUNCTION gets$ ()

‘ Function to read string from ac source

CLS

‘

Clears screen

LOCATE 1, 1

‘

Position cursor at top left

‘ Configure Com1 Port

OPEN “com1:9600,e,7,2,rs,cd,pe,lf” FOR RANDOM AS #1 LEN = 1000

PRINT #1, “*RST”

‘ Resets the ac source

PRINT #1, “VOLT 60”

‘ Set voltage to 60 volts

PRINT #1, “FREQ 50”

‘ Set frequency to 50 hertz

PRINT #1, “OUTPUT ON”

‘ Turn on the output

PRINT #1, “*IDN?”

‘ Query the ac source identification string

PRINT gets$

‘ Go to gets$ Function and print data returned

PRINT #1, MEAS”VOLT?”; volt

‘ Query the ac source voltage

Volt = VAL (gets$)

‘ Convert gets$ string to a value

PRINT gets$

‘ Print the value of the voltage

END

‘ End of main program

FUNCTION gets$

‘ Get a new line feed terminated string from device #1

C$ = “”

‘ Set C$ to null

WHILE c$ <> CHR$ (10)

‘ Set loop to stop at Line Feed

C$ = INPUT$ (1, #1)

‘ Read 1 bit into file #1

Resp$ = resp$ + c$

‘ Concatenate bit with previous bits

WEND

‘ End of WHILE loop

gets$ = resp$

‘ Assign response to gets$

END FUNCTION

 

RS-232 Troubleshooting

If you are having trouble communicating over the RS-232 interface, check the following:

♦The computer and the ac source must be configured for the same baud rate, parity, and number of data bits. Note that the ac source is configured for 1 start bit and 2 stop bits (these values are fixed).

♦The correct interface cables or adaptors must be used, as described under "RS-232 Connector" in the User’s Guide. Note that even if the cable has the proper connectors for your system, the internal wiring may be incorrect.

♦The interface cable must be connected to the correct serial port on your computer (COM1, COM2, etc.).

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Agilent Technologies 6811B, 6834B, 6814B, 6843A, 6813B, 6812B manual RS-232 Programming Example, RS-232 Troubleshooting
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