Xylem CL500 ONLINE CHLORINE ANALYZERS MODBUS - Manual (Page 12)

4.4 Input Registers
These 16-bit values are readable by the master. The data is stored with the MSB first and then the
LSB.
4.4.1 Valid Command(s)
Code Name Broadcast
0x04 Read Input Registers No
4.4.2 Format
Float – stored in two consecutive addresses, with the first address containing the least significant
word (lower part of mantissa) and the second address containing the most significant word (sign,
exponent, and upper part of mantissa).
4.4.3 Valid Addresses
30001 – 30XXX
4.4.4 Definitions
Address Type Register Value Function
30001, 30002 Float Sensor reading -- The meter reading
30003, 30004 Float Sensor reading raw -- Sensor reading to six significant places
30005 Int Version major -- Software version major number
30006 Int Version minor -- Software version minor number
30007 Int Version revision -- Software version revision number
30008 Int Model number -- Product number
30009 Int Model suffix number -- Options – model dependent
0 unknown
1 normal
2 Over
range
3 Under range
4 need standard
5 need sample
30010 Int Reading status
6 reading problem (Err)
0 Revision 1 30011 Int PCB Revision
1 Revision 2
0x0000 normal
0x0001 Error
0x0002
Alarm 1 is active
0x0004 Alarm 2 is active
30012 Int Instrument error
summary (bit-mapped)
0x0008 Calibration error
0x00000 Normal
0x00001 Alarm 1 active (ALM1)
0x00002 Alarm 2 active (ALM2)
0x00004 Data over-range (OVER)
30013, 30014 Long Level 4 Errors (bit-
mapped), least severe
0x00008 Reading error (Err)
CL500 Modbus (3/09)
Rev. 1.3 10