Picotest M3500A User Manual page 116

How to connect a computer or Terminal with the RS-232
To connect the M3500A to a computer or terminal, a proper interface
cable is essential. Most computers and terminals belong to DTE (Data
Terminal Equipment) devices including the DMM. You must apply a
DTE-to-DTE interface cable, which is commonly called null-modem,
modem-eliminator, or crossover cable (DB-9, Female to Female pin).
The calbe pin diagram is shown below.
Troubleshooting about the RS-232
There are some troubleshootings when you meet problems on the
RS-232 communication.
Check that the M3500A and your computer are configured for the
same baud rate, parity, and number of data bits. Confirm that your
PC is set up for 1 start bit and 2 stop bits (The values are fixed on the
DMM).
Check that the interface cable and adapters have been connectd
correctly, even the DB-9 Cable type, straight or crossover type.
Check that the interface cable has been connected to the correct
serial port on your PC (COM1, COM2, etc).
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