Apogee Instruments S2-141 Benutzerhandbuch - Seite 14

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Integer Registers

*Registers marked with an asterisk (*) cannot be written to unless a specific procedure is followed. Contact

Apogee Instruments to receive the procedure for writing these registers.

Write only registers (function code 0x10).

Integer Registers

Packet Framing:

Apogee sensors use Modbus RTU packets and tend to adhere to the following pattern:

Slave Address (1 byte), Function Code (1 byte), Starting Address (2 bytes), Number of Registers (2 bytes), Data

Length (1 byte, optional) Data (n bytes, optional)

Modbus RTU packets use the zero-based address when addressing registers.

For information on Modbus RTU framing, see the official documentation at

http://www.modbus.org/docs/Modbus_Application_Protocol_V1_1b3.pdf

baudrate (0 = 115200, 1 = 57600, 2 = 38400, 3 = 19200, 4 = 9600, any other

190

PAR offset*

Far-red multiplier*

Far-red offset*

running average

heater status

slave address

model number*

serial number*

number = 19200)

parity (0 = none, 1 = odd, 2 = even)

number of stopbits

PAR multiplier (shifted two decimal points to the left)*

PAR mV offset (shifted four decimal points to the left)*

Far-red multiplier (shifted two decimal points to the left)*

Far-red mV offset (shifted four decimal points to the left)*

running average

heater status

Writing to this register resets Coefficients to firmware

defaults. (NOT factory calibrated values!) Slave Address =

1, Model = 442, Serial = 1000, Baud = 3, Parity = 2, Stopbits

= 1, running average = 1