Working voltage: DC 8-25V(Recommend DC 12V); Working current: 8-13MA MODBUS RTU protocol, 03 read , 06 write . Serial port baud rate: 9600 (default), N, 8, 1 By modifying the 485 address, up to 247 modules can be cascaded (more than 16 please R485 repeater); Can read temperature and PT100 resistance value Adapted sensor: PT100 3-wire or 2-wire sensor Temperature measurement range: B version -20 to +220. It is recommended to select a version with a smaller range within the range meets the measurement. Temperature measurement accuracy: 1% , if the temperature deviation is too , please recalibrate. Size: 60 X 30 X 16MM Weight: 16g Type:Logic ICs Number:PTA9B01 Dissipation :-0.2W color:Green Material:Circuit board + electronic accessories Package Contents: 1 x PTA9B01 PT100 RS485 Acquisition module Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.