Geist Watchdog Wi Instruction Manual page 74

74 Geist Watchdog Wi Instruction Manual
Packet Communications for the Watchdog Wi
This section outlines the registers with the name and a brief description of each.
Function 03: Read Output Registers
To read the Watchdog Wi 's 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.).
Read Output Registers Packet Structure
Read Registers Request Packet
Slave Address (1 byte)
03 (Function code) (1 byte)
Start Register (2 bytes)
# of registers to read (2 bytes)
Crc Checksum (2 bytes)
The register settings illustrated here are representative of only ONE sensor. Each sensor
has a unique register ID that can be found on that sensor's Sensor Objects
Read Output Registers
Register
40001
40002
40003
40007
40009
GM1212 Geist Watchdog Wi Instruction Manual
Name
Sensor
Id Identification
number
Shows when the
sensor is in
Out Of Service
maintenance
mode or offline
WireFree sensor
Serial #
serial number
First data value
Raw Data #1 displayed by
sensor
Second data
Raw Data #2 value displayed
by sensor
Read Registers Response Packet
Slave Address (1 byte)
03 (Function code) (1 byte)
Byte count (1 byte)
First register (2 bytes)
Second register (2 bytes)
...
Crc Checksum (2 bytes)
Description
uint16
uint16
uint16x4
Unsigned 32 bit
integer
Unsigned 32 bit
integer
page.
Units Range
0-65535
0-65535
0-65535
0-4294967295
0-4294967295
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