Directions for FFD-3088K 8 Thermocouple Acquisition Module

一、Summary

Main characteristics:

 Temperature acquisition module based on RS485 interface and Modbus protocol. The internal temperature calculation of the module can be read out directly in degrees Celsius. The module interface has all protective components to protect the interface chip.

 Adopt standard 35 mm guide rail installation mode.

Size :88*72*59

 Working temperature :-35℃~50℃.

Application field: liquid, gas temperature measurement field.

 Adopt 8 MAX31885 thermocouple special chip, high precision cold end compensation. Support K、J、N、T、E type thermocouple.Hardware and hardware filtering. Support broken line detection function. resolution 0.25℃. The temperature range is shown in the table below:

Input impedance: more than 2 MΩ, the input interface has protection function

Precision: within temperature range±0.5℃。

二、Main technical indicators

 Supply voltage ：24VDC±10% 或 12VDC±10%

 Output ：RS485Output

 Transmission Protocol ：MODBUS Agreement

 Startup time ： Within 2 seconds

 Ambient temperature： 0 to 60℃

 Display mode ： LED or LCD (with backlight)

 Environmental humidity ：5%-95%， No dew

 Vibration ：≤10g，f≤55Hz，Amplitude≤0.5mm

 LEDState ： When there is communication (read, write), the indicator lights flicker ;2 seconds no communication indicator    lights on.

三、Connection method and terminal function

Terminal Function Definition：

A（D+）：RS485 Serial communication A

B（D-）：RS485  Serial communication B

 Power supply V+：DC Power Positive 

四、Overall dimension（unit mm）

3. Register information table and function code - function code 03 H( read),06 H( write)

 Parameter Setting Register Information Table

Note: the purpose of this function is to prevent accidental modification of parameters. When the parameter protection function is turned on ,10 parameter registers can be modified within 255 seconds H-11H power on. After 255 seconds ,10 H-11H will not be written, can only be read, and trying to write to these registers will return an error reply. When the current protection state = closed, the user operation sets the protection state = open. After the device receives the command, if the boot exceeds 255 seconds, it will immediately enter the protection state; less than 255 seconds, it will delay to 255 seconds to enter the protection state. To turn off the protection, the device  Must be re-powered and reset within 255 seconds.

六、Precautions for use

1、Please read the instructions carefully before using.

2、Access to the correct power supply to prevent damage to the instrument.

3. We leave the factory as required, if not very understanding, please do not operate the instrument.

4. Please confirm the specially customized parameters to prevent unnecessary trouble.