GASSONIC OBSERVER-i
iv
4.5.7. Setting / Checking Alarm Latching ON / OFF .......................................................................... 35
4.5.8. Setting / Checking Factory Default ON / OFF .......................................................................... 36
4.5.9. Switching HazardWatch Mode ON/OFF .................................................................................. 38
4.5.10. HART ON/OFF ......................................................................................................................... 39
4.5.11. Setting HART Analog Output Range (only if HART is on) ....................................................... 40
4.5.12. Modbus Setting: Baud (Channel One) ..................................................................................... 41
4.5.13. Modbus Setting: Format (Channel One): ................................................................................. 42
4.5.14. Modbus Setting: Address (Channel One) ................................................................................ 43
4.5.15. Baud (Channel Two) ................................................................................................................ 45
4.5.16. Format (Channel Two) ............................................................................................................. 46
4.5.17. Address (Channel Two) ........................................................................................................... 47
4.5.18. Loop Test ON/OFF (LTON/LTOF) ........................................................................................... 47
5.0FUNCTION TEST, GAIN TEST AND CALIBRATION.......................................................... 48
5.1. Gassonic SB100 Ultrasonic Bump Tester ................................................................................ 48
5.2. Gassonic 1701 Portable Test and Calibration Unit .................................................................. 49
5.3. Gain Test .................................................................................................................................. 49
5.4. Calibration ................................................................................................................................ 49
6.0MODBUS DIGITAL INTERFACE ......................................................................................... 52
6.1. Baud Rate ................................................................................................................................ 52
6.2. Data Format ............................................................................................................................. 52
6.3. Modbus Read Status Protocol (Query/Response) ................................................................... 52
6.3.1. Modbus Read Query Message ................................................................................................ 52
6.3.2. Modbus Read Response Message .......................................................................................... 53
6.4. Modbus Write Command Protocol (Query/Response) ............................................................ 53
6.4.1. Modbus Write Query Message ................................................................................................ 53
6.4.2. Modbus Write Response Message .......................................................................................... 54
6.4.3. Function Codes Supported ...................................................................................................... 54
6.5. Exception Responses and Exception Codes ........................................................................... 54
6.5.1. Exception Responses .............................................................................................................. 55
6.5.2. Exception Code Field ............................................................................................................... 55
6.6. Command Register Locations .................................................................................................. 56
6.6.1. Operational Mode Commands ................................................................................................. 56
6.7. Gassonic Observer-i Command Register Details .................................................................... 61
6.7.1. Analog (00H) ............................................................................................................................ 61
6.7.2. Mode (01H) .............................................................................................................................. 61
6.7.3. Primary Fault Status/Error 1 (02H) .......................................................................................... 62
6.7.4. Fault Status/Error 2 (03H) ........................................................................................................ 63
6.7.5. Model Type (04H) .................................................................................................................... 63
6.7.6. Software Revision Major (05H) ................................................................................................ 63
6.7.7. dB Level (06H) ......................................................................................................................... 63
6.7.8. Peak Sound (07H) .................................................................................................................... 63
6.7.9. Unit Temperature (08H) ........................................................................................................... 64
6.7.10. Modbus Display (09H, 0AH) .................................................................................................... 64
6.7.11. Serial Number (0BH, 0CH) ...................................................................................................... 64
6.7.12. Trigger Level (0DH) .................................................................................................................. 64
6.7.13. Trigger Delay (0EH) ................................................................................................................. 64
6.7.14. Comm 1 Address (0FH) ........................................................................................................... 64
6.7.15. Comm 1 Baud Rate (10H) ....................................................................................................... 64
6.7.16. Comm 1 Data Format (11H) .................................................................................................... 65
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