WP321 - 1104 adc sense voltage too low

Hello, 

I have a problem with the '1104 adc sense voltage too low' error. I connected a 4-wire strain gauge to the module.

SIG+- from tensometr connected to:  pins 1 and 2
SEN+- not connected (4-wire tensometr): pins 3 and 4
EXC+- from tensometr connected to: pins 5 and 6

Between sig+ and sig- I measured the voltage 0,5mV which increases when I press on the strain gauge.