Digital single-phase Din Rail Meter Counter 2P Electronic Meter

The single-phase two-wire din-rail energy meter also has a pulse output independent of the internal circuit. The port 21 of the meter is connected to the positive pole, and the port 20 is connected to the negative pole. The port 23 is the positive pole of RS485, and the port 24 is the negative pole of RS485. The circuit requires a voltage of 5~27V DC and a maximum current of 27 mA DC.

1.9.4 RS485 Communication Meter Reading Application (Communication Protocol) and Register Address

The meter can remotely record data such as electric energy in the meter through his RS485 interface and transcribe the electric energy data in the meter at close range with the handheld computer through its infrared communication interfac. The encoding format, parity (even parity) and data transmission mode (eight data bits, one stop bit) meet the MODBUS-RTU standard requirements. The communication baud rate can be 1200bps, 2400bps, 4800bps or 9600bps (default). If there is no special requirement, the meter is set according to the default baud rate of 9600bps. The meter address and communication baud rate can be modified by the software we provide.

The meter uses two types of registers, independently addressed.

The first type is the data register, read-only, using command code 0x04 to read.

The second type is the parameter register, which is readable and writable, read using command code 0x03, and set using command code 0x10.

Like RS-422, RS-485 has a maximum transmission distance of approximately 1219 meters and a maximum transmission rate of 10 Mb/s. The length of the balanced twisted pair is inversely proportional to the transmission rate. It is possible to use the longest specified cable length only when the transmission rate is below 100 kb/s. The highest rate transmission is only possible at very short distances. Generally, the maximum transmission rate of a 100-meter twisted pair cable is only 1 Mb/s.

The network topology of RS-485 generally adopts a terminal-matched bus type structure and does not support ring or star networks. It is preferable to use a bus to connect the various nodes in series, and the length of the lead line from the bus to each node should be as short as possible so that the reflected signal in the lead line has the least influence on the bus signal. In summary, a single, continuous signal path should be provided as the bus.

The shield of the shielded twisted pair should be connected to the shield terminals of each RS-485 device. The shield is only allowed to be grounded at one point.

RoHS Compliant Lead Free Status 230V Reference Voltage ,5A Fundamental Current 80A Maximum Murrent Working Frequency is 50Hz±10% Internal Power Consumption is ≤2W / 10VA

The meter uses two types of registers, independently addressed.

The first type is the data register, read-only, using command code 0x04 to read.

The second type is the parameter register, which is readable and writable, read using command code 0x03, and set using command code 0x10.

The meter can remotely record data such as electric energy in the meter through his RS485 interface and transcribe the electric energy data in the meter at close range with the handheld computer through its infrared communication interface