how do i send commands to thermostream?

I write some script and matlab send me a warning: ter=tcpip('1xx.2xx.2xx.1xx',40957); set(ter,'Terminator',{'LF/CR','LF/CR'}); fopen(ter); fscanf(ter) fprintf(ter,'LGIN X')

Warning: Unsuccessful read: A timeout occurred before the Terminator was reached. ans = 0×0 empty char array

How can i solve my problem? p.s.: time which need to the terminator i changed.