Iot Tracking Device 4 20 MA Controller LTE To Rs485 Modbus Tcp Modem

• Introduction​ of 4 20 mA Controller

ZHC4661 is an industrial-grade 4G RTU that provides 4 channels of AI, 2 channels of AO and 1 channel of RS485 interfaces, supports Modbus RTU/TCP adaptive, automatic acquisition and active reporting, 4-20mA analog control acquisition, automatic calibration threshold reporting, support one-to-one, many-to-one connection, which can be widely used in power systems.

Parameters of 4 20 mA Controller

Function of 4 20 mA Controller ZHC4661

The signal current of general instruments is 4-20mA, which means that the minimum current is 4mA and the maximum current is 20mA. When transmitting a signal, consider that there is also resistance on the wire. If voltage transmission is used, a certain voltage drop will be generated on the wire, and a certain error will occur in the signal at the receiving end. Therefore, the current signal is generally used as the standard transmission of the transmitter.
ZHC4661 is a remote control product that supports analog follow and control acquisition.
Support 4 analog inputs, default current detection.
Support 2 analog output, default current output.
Support analog follow and control acquisition.

Operating Mode

Host mode: In this mode, the server can send Modbus data (the address is the product address) to communicate with the product. If the sent data cannot be identified by the product, it will forward the data to the RS485 bus where the product is located; Devices on the same RS485 bus can also send Modbus data (the address is the product address) to communicate with the product. If the data cannot be identified by the product, it will forward such data to the server.
Slave mode: In this mode, the server can send Modbus data (the address is the product address) to communicate with the product. If the sent data cannot be identified by the product, the data will be directly discarded and will not be forwarded; Devices on the same RS485 bus can also send Modbus data (the address is the product address) to communicate with the product. If the data cannot be identified by the product, such data will be directly discarded and no longer forwarded.

FAQ

Q1. How can we know the product quality?
A1: We have professional QA and QC teams, 100% quality inspection is performed before the goods out of the factory.
Q2:Can I have a small order? what's ur MOQ?
A2: Welcome to order sample to test and check quality. MOQ is 1 for normal item.
Q3: If I am not familiar with the operation, do you have a manual to help?
A3: Our Software, User Manual and Programme case can be downloaded freely on our official website, or you could consult the sales for those documents.Meantime, we have engineers team who could do help on your technician problem and give you useful solution.
Q4: Does your factory have the design and development capabilities, can you factory accept customized products?
A4: Our R&D department are well experienced in the IoT industry, We can make customized products especially for you.