Serial Interface with Matlab on Lakeshore Gaussmeter 450

Hi All,

I am currently trying to interface the Lakeshore Gaussmeter 450 with Matlab but it does not work.

I use the Serial I/O connector, connected to "LSCI Model4003 RJ-11 to DE-9 Adapter" as shown in the User Manual (4.2.1).

The Adapter is then connected to a DE-9 to USB adapter before reaching my PC.

I have derived the characteristic of the serial port from the User Manual (4.2.3)

Port definition

GAUSS_PROBE=serial(GAUSS_PROBE_COM,'BaudRate',300,'DataBits',7,'Parity','odd','StopBits',1,'Terminator','CR/LF')

The port opens. Then, I gave a read/write trial (without success)

Write (the remote mode being set, this command should disable it)

fprintf(GAUSS_PROBE,'MODE 0');

Read (this command should read the field value)

fprintf(GAUSS_PROBE,'FIELD?');
pause(wait);
disp(GAUSS_PROBE.BytesAvailable);

The Gaussmeter does not reply (BytesAvailable=0).

Using a null modem as advided in User Manual (4.2.1) does not help. Moreover, BaudRate and Terminator (CR+LF) are correctly set. Finally, I played also with the Endianess (MSB or LSB first), but it did not help neither.

Any advice? Thanks in advanced for your help.