Veris Industries LDRA6 USER GUIDE - Manual (Page 25)

User Guide: LDRA6 Appendix A: Modbus Communications
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Table 6: Status Flags (Register 30008)
Bit Read Registers Response Packet
00 0 = Zone 1 Configured for Leak Detection / 1 = Zone 1 Configured for Dry Contact
01 0 = Zone 2 Configured for Leak Detection / 1 = Zone 2 Configured for Dry Contact
02 0 = Zone 3 Configured for Leak Detection / 1 = Zone 3 Configured for Dry Contact
03 0 = Zone 4 Configured for Leak Detection / 1 = Zone 4 Configured for Dry Contact
04 0 = Zone 5 Configured for Leak Detection / 1 = Zone 5 Configured for Dry Contact
05 0 = Zone 6 Configured for Leak Detection / 1 = Zone 6 Configured for Dry Contact
06-15 0
A-2.3 Present Single Register
To set a LDRA6 parameter value, the master must send a Preset Single Register request packet. The Preset
Single Register request packet specifies a register and the data to write to that register. The register is
numbered from zero (40001 = zero, 40002 = one, etc).
Table 7: Present Single Register Packet Structure
Preset Registers Request Packet Preset Registers Response Packet
Slave Address (1 byte) Slave Address (1 byte)
06 (*Function code) (1 byte) 06 (Function code) (1 byte)
Register (2 bytes) Register (2 bytes)
Data (2 bytes) Data (2 bytes)
Crc Checksum (2 bytes) Crc Checksum (2 bytes)
A-2.4 Present Multiple Registers
To set multiple LDRA6 parameter values, the master must send a Preset Multiple Registers request packet.
The Preset Multiple Register request packet specifies a starting register, the number of registers, a byte
count and the data to write to the registers. The register is numbered from zero (40001 = zero, 40002 =
one, etc).
Table 8: Present Multiple Registers Packet Structure
Preset Registers Request Packet Preset Registers Response Packet
Slave Address (1 byte) Slave Address (1 byte)
16 (Function code) (1 byte) 16 (Function code) (1 byte)
Start Register (2 bytes) Start Register (2 bytes)
# of registers to write (2 bytes) # of registers (2 bytes)
Byte Count (1 byte) Crc Checksum (2 bytes)
Data (2 bytes)
…
…
Crc Checksum (2 bytes)