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GASSONIC OBSERVER-i
64
6.7.9. Unit Temperature (08H)
A read-only accessible register contains the value of internal unit temperature expressed in
0.1°C units.
These functions are indicated on the Low Data Byte and the High Data Byte is not used.
6.7.10. Modbus Display (09H, 0AH)
09H: A read-only accessible register contains the upper two ASCII characters shown on the Gassonic
Observer-i display
.
0AH:
A read-only accessible register contains the lower two ASCII characters shown on the Gassonic
Observer-i display
.
6.7.11. Serial Number (0BH, 0CH)
The serial number is a 32-bit word but the value is only 23 bits long. The upper bits are always zero.
This is done to keep the same serial number as the HART serial number. Address 0x16 contains the
lower part of the number and address 0X15 contains the upper part.
6.7.12. Trigger Level (0DH)
This is a read/write register. A read will return the present trigger level. Since the trigger level can only
be incremented by 5, only certain values are allowed.
EXCEPTION -
If an illegal data value is entered (must be one of the numbers in the table), then the
Exception Code 03 (Illegal Data Value) is returned.
Valid Trigger levels
44 49
54
59
64
69
74
79
84
89
94 99 dB
Table 16: Trigger Levels
6.7.13. Trigger Delay (0EH)
This is a read/write register. A read will return the present time delay. The time delay has a range of
0 to 240 seconds. A one represents 1 second.
EXCEPTION -
If an illegal data value is entered (must be between 0-240), then the Exception Code 03
(Illegal Data Value) is returned
6.7.14. Comm 1 Address (0FH)
A read returns the Comm 1 address of the Gassonic Observer-i. A write changes the address to the
requested address. The range of the address is 1 to 247 (01 to F7 Hex). After the address has been
changed to the slave unit, the Modbus communications will cease because the address has changed;
therefore the master will have to change its query address to the slave’s new address in order to
restart the communications.
EXCEPTION -
If an illegal data value is entered (must be between 1-0x00F7), then the Exception Code
03 (Illegal Data Value) is returned.
NOTE:
The default Address is 1.
6.7.15. Comm 1 Baud Rate (10H)
A read returns the Comm 1 baud rate of the Gassonic Observer-i. A write changes the baud rate to the
requested baud rate. After the baud rate has been changed to the addressed unit, the Modbus
communications will cease because the baud rate has changed; therefore the master will have to
change its baud rate to the slave’s new baud rate in order to restart the communications.