ModBus Interface
iTrans Fixed Point Single/Dual Gas Monitor
6-4
INDUSTRIAL SCIENTIFIC
(P/N: 77023554)
Addr
Inst
R/W
Host
R/W
Range Description
40103
R*
R*
MSB = $01 to $FF
LSB = $01 to $FF
Gas Type
Holds the decimal place holder and the gas type
code. The most significant byte (MSB) holds
the number of decimal places to be used in
calculations for this gas. This decimal locator
applies to all subsequent values of gas readings
within other registers. This can be read by the
instrument. The least significant byte (LSB)
holds a code which identifies the gas type.
This can be read by the host.
MSB = Decimal place holder $01 to $FF
LSB = Gas type code
$01 to $FF
$01
CO
Carbon Monoxide
$02 H
2
S
Hydrogen Sulfide
$03 SO
2
Sulfur Dioxide
$04 NO
2
Nitrogen Dioxide
$05 Cl
2
Chlorine
$06 ClO
2
Chlorine
Dioxide
$07 HCN
Hydrogen
Cyanide
$08 PH
3
Phosphine
$09 H
2
Hydrogen
$0C NO Nitric
Oxide
$0D NH
3
Ammonia
$0E HCl Hydrogen
Chloride
$14 O
2
Oxygen
$15 CH
4
Methane
$16
LEL
Lower Explosive Limit
(Combustible
Gases)
Examples:
$0107 = 1 decimal place for gas type HCN
$0002 = 0 decimal places for gas type H
2
S
$0206 = 2 decimal places for ClO
2
Summary of Contents for iTrans 77023554
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Page 86: ...Appendix D iTrans Fixed Point Single Dual Gas Monitor D 2 INDUSTRIAL SCIENTIFIC P N 77023554 ...
Page 88: ...Appendix E iTrans Fixed Point Single Dual Gas Monitor E 2 INDUSTRIAL SCIENTIFIC P N 77023554 ...
Page 94: ...Index iTrans Fixed Point Single Dual Gas Monitor vi INDUSTRIAL SCIENTIFIC P N 77023554 ...
