1.5.2 Current Loop Adaptor Tri-colour LED Indications

The Tri-colour LED (red, green and blue) is used to indicate the WLTS Current Loop Adaptor status or error.

During each WLTS Current Loop Adaptor power up, the LED will blink each colour as a self-test.

Red LED:

When an error occurs in User Operation Mode (SW=1), the red LED will blink to indicate error code information:

• 1 blink – supply power is out of range of 8.5–36V
  • Check supply voltage or wire connections
• 2 blinks – WLTS communication failed
  • Check SW position, should be SW=1
    
  • Check for WLTS wire connections to WLTS Current Loop Adaptor (Section 1.5.1)
    
  • Check whether WLTS is set to "Use Current Loop Adaptor" (Modbus interface, Address=1, Baud Rate=19200 bps, Even Parity, 1 Stop bit) in the WLTS PC Software Utility (Section 2.2)
    
  • The WLTS may not be working properly, contact Solinst
• 3 blinks – received current-loop value for CL1 (temperature) is out of range of 3~21 mA
  • Check the WLTS temperature value directly read out using the WLTS PC Software Utility (see Section 2.2)
• 4 blinks – received current-loop value for CL2 (pressure) is out of range of 3~21 mA
  • Check the WLTS pressure value directly read out using the WLTS PC Software Utility (see Section 2.2)
• 5 blinks – WLTS Current Loop Adaptor internal memory checksum error
  • Re-cycle the power supply, if still occurs, contact Solinst
• 6 blinks – WLTS Current Loop Adaptor on board temperature sensor communication failed
  • Re-cycle the power supply, if still occurs, contact Solinst

The error information can also be read out using the WLTS PC Software Utility. See Section 2.3.

Green LED

• A solid green LED indicates that the WLTS Current Loop Adaptor is in Configuration Mode (for WLTS or WLTS Current Loop Adaptor configuration)
• Green LED Blinking – indicates that the WLTS Current Loop Adaptor is receiving/sending a data transmission

Blue LED

• A solid blue LED indicates that the WLTS Current Loop Adaptor is in firmware upgrade mode
• Blue LED blinking – indicates that WLTS Current Loop Adaptor is in bootloader mode receiving/ sending a data transmission