RS485 to LTE 4 20 mA Controller Wireless Control for Agriculture IOT Project

• Introduction​ of ZHC4661

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.

Antenna: LTE network antenna
SIM: Press the yellow dot on the side of the SIM card slot, pop out the card tray, and insert the SIM card
RESET: restore factory button
DC12~36V (DC power socket): DC12~36V input
DC12~36V (terminals): DC12~36V input
POW: Power indicator
WORK: Equipment operating status indicator
LINK: Network status indicator
DATA: Data transmission indicator
AI: 4~20mA analog signal input
485: RS485 interface
AO: 4~20mA analog signal output
Wiring: PC is connected to ZHC4661 via USB to RS485 tool.
Networking: Insert the SIM card before powering on the device.
Power supply: DC12~36V.
After power-on, open the corresponding serial port, you can configure the ZHC4661 through the host computer

Parameters of ZHC4661

Function of 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.

Founded in 2015, Chengdu Zongheng Intelligence Control Technology Co., Ltd. is a high-tech enterprise focusing on the research, development, production and sales of Internet of Things communication control terminal products and related overall solutions. Takes the IOT intelligent communication terminal as the entry point, combines edge computing and big data cloud platform, and realizes data collection, transmission and intelligent control and other functions in the application of the Internet of Things. At present, the company's products have been widely used in intelligent water conservancy, intelligent agriculture, intelligent audio-visual and other scenes.