4-Channel 485 Data Acquisition Instrument can be used in conjunction with various sensors and transmitters. It enables cyclic inspection, 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 is centered on high-speed signal processors and microprocessors, featuring a digital design for enhanced intelligence.
Equipped with an opto-isolated RS-485 communication interface, it adopts the ModBus RTU communication protocol. The circuit design implements three-terminal isolation for input, power supply, and output.
Features
4 independent inputs
Support 24 kinds of industrial signals
Support 2-way transmitting output
Support 2-way relay warning output
Support Modbus communication
Inputs
K, S, R, T, E, J, B, N
WRe3 - WRe25, WRe5 - WRe26
4 - 20mA, 0 - 20mA
Cu50, PT100
0 - 80Ω, 0 - 400Ω
0 - 20mV, 0 - 100mV
0 - 1V, 1 - 5V, 0 - 5V
-20 - +20mV, -100 - +100mV, -5V - +5V
Outputs
0 - 5V, 1 - 5V, 0 - 10V
0 - 10mA, 0 - 20mA, 4 - 20mA
Communication
Photo - isolated RS - 485 communication interface
Warning
2 - way relay output
Other Detailed Parameters
| Input channel number | 4 independent channels, different input types are allowed. |
| Input signal range | 24 common industrial standard signals |
| 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, ≤300Ω for current, ≤0.25mA for thermistor, ≥500KΩ for thermocouple |
| Output impedance (load - bearing capacity) | ≥250KΩ for voltage, ≤300Ω for current (if there are special requirements for current, it can be up to 650Ω, please indicate when ordering), relay AC120V/1A, DC30V/1A |
| Display mode | Digital tube |
| Sampling period | 0.32S/0.64S |
| Communication mode | RS485 interface, two - wire system |
| Drive distance | 1200 meters |
| Communication protocol | MODBUS RTU |
| Parity check mode | No parity check, odd parity check, even parity check |
| Baud rate | 4800, 9600, 19200 |
| Communication data format | One start bit, eight data bits, one stop bit |
| Power supply voltage | AC220V |
| Isolation voltage | 2000V AC for 1 minute |
| Working conditions | Temperature |
| Storage conditions | Temperature |
| Opening size | 92×44mm, 35mm rail - mounted version |
| Model Selection Size | DK21H8: 96×48×90mm |
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