Problem regarding Igor and Kiethley 2420

Dear Sir/Madam,

We have been using Keithley source meter 2400 with solar simulator for solar cell testing. We have recently purchased Keithley source meter 2420 and we have installed Igor s/w on it. With all the connections properly made the Keithley source meter 2420 with RS 232 and is showing s/w error shown below. Kindly guide us for the proper working of the s/w

Macro Execute Error
timeout while reading data
Error in Procedure:readdata
VDTREAD/0=3 S1, S2, S3, S4, S5




awaiting your earliest reply
Most likely your RS232 communication to the 2420 is not working at all. You should check the RS232 settings (baud rate, number of bits, etc.) on the 2420.