Intelligent eight channel isolation collector,8Channel relay output control

Instruction Manual

I. Overview

YK8D8G series eight channel isolation collector adopts high-performance data collector. This collector has 8 resistance current input channels, with fully isolated inputs between channels. Using a high-speed 16 bit A/D sampling chip enables the system to collect data quickly and with high accuracy. Connected to computers or PLCs through RS485 interface, using Modbus RTU communication protocol, compatible with various configuration software at home and abroad. Users can use multiple isolation testers to build their own data acquisition system, which can also be used in conjunction with a programmable logic controller (PLC). It can have multiple analog and switch outputs.

2、 Main technical indicators：

Basic error: 0.2% FS ± 1 word. Input signal: Thermal resistor Pt100. Communication output: RS485 interface, baud rate 2400 or 9600bps

Power supply: Switching power supply 85-265VAC or DC24V. Power consumption:<1W. Environmental temperature: 0-50 ℃

Environmental humidity:<85% RH

Size: 145 × 90 × 40mm

3、 Terminal wiring

4、 Selection instructions

5、 Communication instructions

This instrument can be equipped with RS232 and RS485 interfaces for direct communication with a computer. The RS485 standard communication distance is 1.5km, and multiple instruments can be attached. The RS232 standard communication distance is 15m, and only one instrument can be attached. The TXD, RXD, and GND of the RS232 interface are respectively connected to the second, third, and fifth pins of the computer serial port. The data format consists of 1 start bit, 8 data bits, no checksum, and 1 stop bit. To avoid communication conflicts, the instruments are all in listening mode. The computer sends a command to a certain instrument at a specified address, and then waits for a period of time for the instrument to respond. After the instrument receives the correct command, it sends out the data. After sending, the instrument is in listening mode again. In the same system, instrument addresses cannot be the same, and the baud rate must be *.

The instrument adopts the standard Modbus rtu communication protocol and supports function numbers 03 and 06. When using configuration software, the device to be selected is a Modicon PLC, Modbus RTU address type, with integer 16 bit data, starting from 4x001 or 4x000 using the Kingview register. Other configuration software may start from 3x001 or 3x000. The communication is an integer, and users need to handle the decimal places according to the actual situation. Communication transmission data is signed integer data, and it is recommended to define signed integer data for user programming. When the data is greater than 0x8000, the actual negative value is obtained by adding 1 in reverse. For example, if the communication transmission data is 0xFFFF, the corresponding data value is -1. For long integer data such asAccumulated quantity, etc., data value=high position×65536+Low position. During configuration, users can also choose the data type as long, and the system will automatically calculate the cumulative amount.

Read instrument data and send command format: It is recommended to read no more than 16 data at a time

On site measuring instruments return data format:

Write data to instrument and send command format: (Write to register)

Data format returned by on-site measuring instruments: (same as the data format sent)

Example: Read the first measurement value of the instrument with address 1 (PV1=1000)

Send data as 01 03 00 00 00 01 84 0A

The returned data is 01 03 02 03 E8 B8 FA (including 03 E8-1000)

Among them, 01 is the instrument address, 03 is the function number, 00 00 is the register starting address, 00 01 represents reading a number, 840A is the checksum, and B8 FA in the returned data is the checksum. If you want to read the first and second data, you can send 01 03 00 00 02 C4 0B, and read 16 data and send 01 03 00 00 10 44 06.

Communication measurement value return value=(measurement value+error correction) * full-scale correction. The full correction range is 0.500 to 2.000, and users can also omit this measurement error correction and directly perform error correction on the upper computer.

The communication address range is 1-99, and the baud rate can be set to 2400 or 9600. The instrument has a default communication address of 248 (0XF8), which can be used for testing if the user is unsure. The baud rate is 2400 or 9600. After changing the communication address and baud rate, it needs to be powered on again to take effect.

The instrument has been set with a communication address of 1 and a baud rate of 9600 at the factory.

Register correspondence table (please refer to the setting section of the operating instructions for specific meanings)

Input type comparison table:

Beijing Yukotaiji Electronics Co., Ltd

Beijing Yukotaiji Instrument Co., Ltd