Detcon 1000_H2S - Manual (Page 26)

Model 1000 H2S Echem
Model 1000 H2S Echem Instruction Manual Rev. 2.8 Page 22 of 30
Start Address Lo 00 0 0000 0000
No. of Registers Hi 00 0 0000 0000
No. of Registers Lo 06 6 0000 0110
CRC ## #### ####
CRC ## #### ####
The following is a typical Slave Response from device # 8:
Field Name
HEX DEC RTU
Slave Address 08 8 0000 1000
Function 03 3 0000 0011
Byte Count 0C 12 0000 1100
Reg40000 Data Hi 02 2 0000 0010
Reg40000 Data Lo 64 100 0110 0100
Reg40001 Data Hi 00 0 0000 0000
Reg40001 Data Lo 64 100 0110 0100
Reg40002 Data Hi 00 0 0000 0000
Reg40002 Data Lo 07 7 0000 0111
Reg40003 Data Hi 00 0 0000 0000
Reg40003 Data Lo 0A 10 0000 1010
Reg40004 Data Hi 00 0 0000 0000
Reg40004 Data Lo 14 20 0001 0100
Reg40005 Data Hi 05 5 0000 0101
Reg40005 Data Lo 50 80 0101 0000
CRC ## #### ####
CRC ## #### ####
Additional Notes:
The calibration LED will light when the transmitter is sending a response to a Master Query. Communications
are 9600 baud, 8 data bits, 1 stop bit, No parity, and half duplex 485.
10. Display Contrast Adjustment
Detcon MicroSafe™ sensors feature a 16 character backlit liquid crystal display. Like most LCDs, character
contrast can be affected by viewing angle and temperature. Temperature compensation circuitry included in
the MicroSafe™ design will compensate for this characteristic; however temperature extremes may still cause
a shift in the contrast. Display contrast can be adjusted by the user if necessary. However, changing the
contrast requires that the sensor housing be opened, thus declassification of the area is required.
To adjust the display contrast, remove the enclosure cover and use a jeweler’s screwdriver to turn the contrast
adjust screw located beneath the metallic face plate. The adjustment location is marked “CONTRAST”.
11. Low Flow Fault Options
Model 1000 Analyzers offer two low flow fault option PCB’s. One monitors for low sample gas flow, and the
second monitors for low airflow dilution. The Low Flow Fault option for sample gas flow is usually set for
the relay contacts to fire at flow rates ≤ 100cc/min. The Flow Fault option for air dilution is usually set for the
relay contacts to fire at flow rates ≤ 300cc/min. These set points are factory set. Should it become necessary
to adjust the flow fault set points in the field, adjust the flow to the set point target (100 or 300cc/min.) at
rotameter(s) and adjust the potentiometer on the corresponding Low Flow Fault PCB until the fault LED
toggles between “ON” and “OFF”.