RLE LD2100 V.2.6 - Manual (Page 69)

rletech.com LD2100 User Guide 69
5 Modbus Communication
5.2. Packet Communications for the LD2100
This section covers the registers with the name and a brief description of each.
5.2.1 Function 03: Read Output Registers
To read the LD2100 parameter values, the master must send a Read Output Registers request
packet.
The Read Output Registers request packet specifies a start register and the number of registers
to read. The start register is numbered from zero (40001 = zero, 40002 = one, etc).
Table 5.2 Read Output Register Packet Structure
Read Registers Request Packet Read Registers Response Packet
Slave Address (1 byte) Slave Address (1 byte)
03 (Function code) (1 byte) 03 (Function code) (1 byte)
Start Register (2 bytes) Byte count (1 byte)
# of registers to read (2 bytes) First register (2 bytes)
CRC Checksum (2 bytes) Second register (2 bytes)
…
Cry Checksum (2 bytes)
Table 5.3 Output Registers
Register Name Description Units Range
40001 Leak Threshold Trip current for leak
alarm
25-295 uAmps 0-65535
40002 Contamination
Threshold
Trip current for
contamination alarm
20-295 uAmps 0-65535
40003 Re-Alarm Delay The time that elapses
between when an alarm
is detected and when it is
annunciated
0-24 Hours 0-65535
40004 Latching Alarms Designate the alarms as
latching or non-latching
0=No, 1=Yes 0-65535
40005 Silence Audible Alarm Silence the audible
alarm
1=Silenced 0-65535
40006 Reset Alarms Reset all the alarms 1=Reset 0-65535
40007 Spare 0-65535
40008 Spare 0-65535
40009 Spare 0-65535
40010 Spare 0-65535