8-Channel Universal Signal Input 485 Module can be used in conjunction with various sensors and transmitters. It is capable of performing periodic inspection and measurement, alarm control, transmission output, data acquisition, and communication for multiple industrial process parameters such as temperature, pressure, liquid level, flow rate, weight, current, and voltage.
Adopting electronic technology, it features a high-speed signal processor and microprocessor as its core, making this digital instrument more intelligent.
It is equipped with a photoelectrically isolated RS-485 communication interface and adopts the ModBus RTU communication protocol. The circuit design incorporates three-terminal isolation for input, power supply, and output.
Features
8 independent input channels, supporting different input types
Supports 24 types of industrial signals
Supports 1 channel of transmission output
Supports 2 channels of relay alarm output
Supports Modbus communication
Input
K-type thermocouple; S-type thermocouple
R-type thermocouple; T-type thermocouple
E-type thermocouple; J-type thermocouple
B-type thermocouple; N-type thermocouple
WRe3-WRe25 thermocouple; WRe5-WRe26 thermocouple; 4～20mA current signal
0～20mA current signal; Cu50 copper resistor
PT100 platinum resistor; 0～80Ω resistance signal;
0～400Ω resistance signal; 0～20mV voltage signal;
0～100mV voltage signal; 0～1V voltage signal;
1～5V voltage signal; 0～5V voltage signal;
-20～+20mV voltage signal; -100～+100mV voltage signal; -5V～+5V voltage signal
Output
0-5V
1-5V
0-10V
0-10mA
0-20mA
4-20mA
Communication
Photoelectrically isolated RS-485 communication interface
Alarm
2 channels of relay output
Other Detailed Parameters
| Parameter Category | Specification Details |
| Number of Input Channels | 8 independent channels, supporting different input types |
| Input Signal Range | 24 types of common industrial standard signals |
| Measurement Range | -1999~9999 |
| Basic Error | 0.002FS±1 digit |
| Resolution | 1/11998 |
| Measurement AD | 20-bit, 25SPS |
| Output DA | 16-bit, 200KSPS |
| Input Impedance | ≥500KΩ for voltage signals, ≤300Ω for current signals, ≤0.25mA for thermal resistors, ≥500KΩ for thermocouples |
| Output Impedance (Load Capacity) | ≥250KΩ for voltage signals, ≤300Ω for current signals (can be 650Ω for special current requirements, please specify when ordering), relay |
| Display Method | Nixie tube |
| Sampling Period | 0.32S/0.64S |
| Communication Method | RS485 interface, two-wire system |
| Driving Distance | 1200 meters |
| Communication Protocol | MODBUS RTU |
| Parity Method |
No parity, odd parity, even parity Baud Rate4 800, 9600, 19200 bps |
| Communication Data Format | 1 start bit, 8 data bits, 1 stop bit |
| Power Supply Voltage | AC220V |
| Isolation Voltage | 2000V AC for 1 minute |
| Operating Conditions | Temperature |
| Storage Conditions Temperature | -40℃～+80℃, Humidity |
| Model Selection Dimensions | 35mm DIN rail mounting |
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