5-23
3550 LCR Meter Instruction Manual Programming and Interfacing
RS-232C
RS-232C Hardware and Computer Settings
Set the settings as indicated below. These are the default settings of the RS-232C interface.
Baud rate 9600 bps
Data length 8 bit
Parity NONE
Stop Bit 1 bit
Sample programs for RS-232C
Explanation of SAMPLE.BAS
The following is a sample program establishing basic initial settings and data
Display conditions for the purpose of controlling the 3550 through the RS-232C.
1000-1070 are initial settings
1010 is the setting for the RS232C environment on the computer side.
1030 is the setting for the "break-in" (interruption) action by the computer.
When the power for the 3550 is turned on, the 3550 sends the text signal "3550" to the computer
in order to determine whether a control device exists on the computer. The computer receives the
signal, and then sends signals to establish the necessary basic settings within the 3550 main unit.
If the textual signal "3550" is received by the computer prior to line "1260" of sample.bas, the
computer will send the command line "E3 REN O1" to the 3550, LCR meter.
For more details regarding "E3 REN O1" and other commands, refer to the command summary,
Tables 5.3a & 5.3b on pages 5-11 and 5-12. Basically, the RS-232C will use the external trigger
and output the measurement data to an external device. The textual signal that the computer
receives at this point will be displayed on the CRT.
The "VER" in 1110 is the output command of the ROM version. The wait times indicated in 1120
and 1125 allow time for the computer to read the data. When the display is finished, the program
will end.
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