... Pressure Data Logger .1-40 Channels/USB/RS485/Relay .Accuracy:+-(0.2%FS+1) .USB drive:Play&Plug .CE Pressure Data Logger ... ,12VDC,24VDC auxiliary power supply for sensors. USB port: plug and play. Support 1GB,2GB,..USB flash driveCommunication: RS485,RS232, MODBUS-RTU protocolPrint ... interval can be set optionally, such as 1, 2, 3, 4, 5,6s……16-channels record time: 360 days(record interval ...