1、 Overview
The photoelectric direct reading remote transmission water meter (hereinafter referred to as the direct reading remote transmission water meter) is a direct reading remote transmission water meter that is convenient for remote meter reading and control, designed to meet the practical needs of daily water use. It adopts M-BUS/RS485 bus communication to achieve remote direct reading of water meter usage, avoiding the need for management departments to come to the door for meter reading. This product also has valve control function (optional), which facilitates the management department to control the water usage of the direct reading remote water meter.

2、 Performance characteristics
1. Due to the direct reading of character wheel data, compared with traditional pulse remote water meters, there is no need to set parameters such as meter base number and meter constant, and there is no cumulative reading error. The mechanical reading and electronic reading remain completely consistent, and there is no situation where the readings of the two are inconsistent due to cumulative error or water meter inversion;
2. Adopting a low-power design, power is only required for reading.
3. Adopting data encoding and verification methods, the communication stability is high.
4. Combined with the upper computer system, establish a remote automatic meter reading management system to truly achieve meter reading and management automation.
5. The electronic reading device does not affect the measurement accuracy of the original instrument.
6. Each table has address codes, bus connections, and simple wiring.
7. The direct reading remote water meter with valve control can also remotely control the opening and closing of the water meter valve through management software.

3、 Electrical parameters
Working power supply: a) DC12V (RS485 interface), b) DC36V (MBUS interface);
Current: Static current 0.8-1.0mA; Working current:<>
Working environment: Temperature: 0.1~+45 ℃ (cold water), 0.1~+90 ℃ (hot water), Humidity: 0~95% RH;
Communication interface with the upper computer: RS-485 bus interface or MBUS bus interface;
Communication protocol: DL645-97/CJ188-2004。
Communication transmission rate: 1200/2400/4800/9600bps optional;
For bus open circuit, short circuit, idle and other fault protection.
Distance from table to data collector: ≤ 500m；
For bus open circuit, short circuit, idle and other fault protection.
There are communication protocols available, including DL/T645-1997 protocol and CJ/T188-2004 protocol.