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.