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Model 4688-IR / Model 4679-IR
Operation & Maintenance Manual
Manual #087-0007G, 10/2003
TAG DATABASE EXAMPLE
NAME
TYPE
UNIT
ADDR
RAW_ZERO RAW_FULL ENG_ZERO ENG_FULL ENG_UNITS FORMAT
GAS_1
REAL
IODev1
40019
0
100.0
0
100.0
PCT
### EU
TEMP_1
REAL
IODev1
40021
0
100.0
0
100.0
DEG
### EU
GAS_2
REAL
IODev2
40019
0
100.0
0
100.0
PCT
### EU
TEMP_2
REAL
IODev2
40021
0
100.0
0
100.0
DEG
### EU
A2_SP_1
REAL
IODev1
40259
A2_RP_1
REAL
IODev1
40263
In general, it will be necessary to configure the master to communicate with
the GasPlus-IR. Modbus
®
drivers are available for most master devices
(DCSs, PLCs, and PC-based MMIs); if a master requires drivers for Modicon
®
PLCs rather than the Modbus™ protocol, users should select the Model 884
driver.
Note: Some parameter addresses may specify "Hi byte" or "Low Byte".
This refers to the area used to store the value within the 16 bit
register:
Registers, Coils, and Addresses
The Modbus
®
protocol allows the master device to read from, or write data to
the transmitter using two data types: coils (1 bit) and registers (16 bits).
However, consecutive groups of coils and registers can be combined to form
other logical and real data types.
Organizing parameter data within transmitter memory improves
communications efficiency. The GasPlus-IR's first 25 registers and
commonly used coil addresses have been organized for just this purpose:
Register Address Description
Suggested Tag
40001
Function select register
FSR
40002
Parameter select register
PSR
40003-40006
Character data registers
CDR1 - CDR4
40007-40010
Integer data registers
IDR1 - IDR4
40011-40014
Long data registers
LDR1 - LDR2
40015-40018
Real data registers
RDR1 - RDR2
40019
Gas concentration (read only)
GAS
40021
Temperature (read only)
TMP
40023
Transmitter status (read only)
STS
40024
General fault status (read only)
GFS
40025
Sensor faults status (read only)
SFS
RE
AD O
N
L
Y
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