Power supply voltage: DC 8-25V (12V recommended), Working current: 8-13MA. MODBUS RTU protocol, 03 read command, 06 write command. Serial port baud rate: 9600 (minimum), N, 8, 1. By modifying the 485 address, up to 247 modules can be cascaded for use (if more than 16, please use R485 repeaters) Can read temperature and PT100 resistance value, Adapted sensor: PT100 3-wire or 2-wire sensor Temperature measurement range: A version -20℃ to +400℃, Temperature measurement accuracy: 1%, if the temperature deviation is too large, please recalibrate Product name: PT100 waterproof and high temperature resistant probe Probe diameter: 6.5MM Probe length: 30MM Cable length: 0.5 meters Measuring temperature range: -200-550 seconds size: 60 x 30 x 16MM Material:abs+metal colour:green Package Contents: 2 x PTA9B01 PT100 RS485 Acquisition module 2 x TB445-50cm PT100 probe 2 x TB444-white shell