Product Details

1 Product Overview

DAQ-GP-IRMODBUSRTU infrared meter reading terminal is a device launched by Shanghai DAQ IoT Technology Co., Ltd. that converts State Grid electricity meters using DLT645/698 protocols into the Modbus communication protocol. It can collect electrical parameter data such as energy, voltage, current and power factor from State Grid electricity meters.

Brief introduction to the infrared meter reading principle: the infrared optical probe periodically reads the parameter information of the smart meter through the infrared optical port and uploads it. The infrared meter reader has the function of infrared signal modulation and demodulation: it modulates a binary digital signal into a pulse sequence at a frequency of 38KHz and drives an infrared emitting diode to send it out in the form of infrared light pulses; the transceiver converts the received light pulses into electrical signals, which after amplification and filtering are sent to the demodulation circuit to be demodulated back into a binary digital signal. After message parsing, it is converted to the Modbus protocol, which can be read by other host computer software.

This terminal supports meter reading scenarios for various meters with infrared communication interfaces, such as electricity meters and gas meters. It is suitable for electricity meter data acquisition, smart city data acquisition, power monitoring data acquisition, energy-saving and emission-reduction data monitoring systems, energy consumption monitoring systems, PV systems, intelligent monitoring, robots, smart security systems and cloud platform systems; and for electricity meter calibration and testing benches. It is especially suitable for PV power generation system energy meter reading and for meter reading when the main meter of a State Grid electricity meter is in a completely sealed state with no seal allowed to be opened.

3 Executive Standards

“Q/GDW1365—2013 Technical Specification for Information Exchange Security Authentication of Smart Electricity Meters” — State Grid standard

“Multi-function Electricity Meter Communication Protocol DLT645-2007” — State Grid standard

“Three-phase Smart Electricity Meter Type Specification Q/GDW1356-2013” — State Grid standard

4 Product Features & Parameters

4.1 Acquisition Characteristics

• Infrared carrier frequency: 38kHz

• Communication baud rate: 1200~115200bps, adaptive according to the electricity meter communication parameters

• Infrared communication distance: ≤10 m

• Communication angle: ≤15 degrees

Infrared communication protocol: compliant with IEC62056-21 (IEC1107) and DL/T-645 1997 and 2007 standards; Modbus protocol supported.

4.2 Electrical Characteristics

• Power supply: 5-24V DC

• Operating power consumption: less than 5W

4.3 Operating Environment

• Temperature -30°C ~ 75°C, humidity 0 ~ 95%

5 Communication Protocol

5.1 Module Configuration Description

MODBUS commands: 0x03: read data command; 0x06: single register write command; 0x10: batch write command.

No.	Register name	Register address	Command	Remarks
1	Address	0xF000	0x03/0x06	Default 1, 255 is the broadcast address
2	645 address	0xF001	0x03/0x06	645 address 1234
3	645 address	0xF002	0x03/0x06	645 address 5678
4	645 address	0xF002	0x03/0x06	645 address 9ABC
5	Meter communication protocol	0xF004	0x03/0x06	0: 645-07 protocol, 1: 645-97
6	Module communication mode	0xF005	0x03/0x06	0: Modbus mode, 1: transparent mode
7	Module acquisition mode	0xF006	0x03/0x06	0: cyclic meter reading, 1: real-time single-command meter reading
8	Module acquisition interval	0xF007	0x03/0x06	Cyclic meter reading interval 1S-60000S
9	Port 4851 (Modbus) baud rate	0xF008	0x03/0x06	0:1200, 1:2400, 2:4800, 3:9600, 4:14400, 5:19200, 6:38400, 7:56000, 8:57600, 9:115200
10	Port 4851 (Modbus) parity	0xF009	0x03/0x06	0: none, 1: even, 3: odd
11	Port 4852 (DLT645) baud rate	0xF00A	0x03/0x06	0:1200, 1:2400, 2:4800, 3:9600, 4:14400, 5:19200, 6:38400, 7:56000, 8:57600, 9:115200
12	Port 4852 (DLT645) parity	0xF00B	0x03/0x06	0: none, 1: even, 3: odd

5.2 Default Modbus Point Table

No.	Register name	Register address	Command	Remarks
1	Combined forward active total energy	1000	0x03	Float, high word first
2	Combined forward active sharp energy	1002	0x03	Float, high word first
3	Combined forward active peak energy	1004	0x03	Float, high word first
4	Combined forward active flat energy	1006	0x03	Float, high word first
5	Combined forward active valley energy	1008	0x03	Float, high word first
6	Current forward active total energy	1010	0x03	Float, high word first
7	Current forward active sharp energy	1012	0x03	Float, high word first
8	Current forward active peak energy	1014	0x03	Float, high word first
9	Current forward active flat energy	1016	0x03	Float, high word first
10	Current forward active valley energy	1018	0x03	Float, high word first
11	Current reverse active total energy	1020	0x03	Float, high word first
12	Current reverse active tariff 1 energy	1022	0x03	Float, high word first
13	Current reverse active tariff 2 energy	1024	0x03	Float, high word first
14	Current reverse active tariff 3 energy	1026	0x03	Float, high word first
15	Current reverse active tariff 4 energy	1028	0x03	Float, high word first
16	Combined reactive 1 total energy	1030	0x03	Float, high word first
17	Combined reactive 1 sharp energy	1032	0x03	Float, high word first
18	Combined reactive 1 peak energy	1034	0x03	Float, high word first
19	Combined reactive 1 flat energy	1036	0x03	Float, high word first
20	Combined reactive 1 valley energy	1038	0x03	Float, high word first
21	Combined reactive 2 total energy	1040	0x03	Float, high word first
22	Combined reactive 2 sharp energy	1042	0x03	Float, high word first
23	Combined reactive 2 peak energy	1044	0x03	Float, high word first
24	Combined reactive 2 flat energy	1046	0x03	Float, high word first
25	Combined reactive 2 valley energy	1048	0x03	Float, high word first
26	Previous settlement day combined active total energy	1050	0x03	Float, high word first
27	Previous settlement day combined active sharp energy	1052	0x03	Float, high word first
28	Previous settlement day combined active peak energy	1054	0x03	Float, high word first
29	Previous settlement day combined active flat energy	1056	0x03	Float, high word first
30	Previous settlement day combined active valley energy	1058	0x03	Float, high word first
31	Previous settlement day forward active total energy	1060	0x03	Float, high word first
32	Previous settlement day forward active sharp energy	1062	0x03	Float, high word first
33	Previous settlement day forward active peak energy	1064	0x03	Float, high word first
34	Previous settlement day forward active flat energy	1066	0x03	Float, high word first
35	Previous settlement day forward active valley energy	1068	0x03	Float, high word first
36	Previous settlement day reverse active total energy	1070	0x03	Float, high word first
37	Previous settlement day reverse active tariff 1 energy	1072	0x03	Float, high word first
38	Previous settlement day reverse active tariff 2 energy	1074	0x03	Float, high word first
39	Previous settlement day reverse active tariff 3 energy	1076	0x03	Float, high word first
40	Previous settlement day reverse active tariff 4 energy	1078	0x03	Float, high word first
41	Previous settlement day combined reactive 1 total energy	1080	0x03	Float, high word first
42	Previous settlement day combined reactive 1 sharp energy	1082	0x03	Float, high word first
43	Previous settlement day combined reactive 1 peak energy	1084	0x03	Float, high word first
44	Previous settlement day combined reactive 1 flat energy	1086	0x03	Float, high word first
45	Previous settlement day combined reactive 1 valley energy	1088	0x03	Float, high word first
46	Previous settlement day combined reactive 2 total energy	1090	0x03	Float, high word first
47	Previous settlement day combined reactive 2 sharp energy	1092	0x03	Float, high word first
48	Previous settlement day combined reactive 2 peak energy	1094	0x03	Float, high word first
49	Previous settlement day combined reactive 2 flat energy	1096	0x03	Float, high word first
50	Previous settlement day combined reactive 2 valley energy	1098	0x03	Float, high word first
51	Phase A voltage	1100	0x03	Float, high word first
52	Phase B voltage	1102	0x03	Float, high word first
53	Phase C voltage	1104	0x03	Float, high word first
54	Phase A current	1106	0x03	Float, high word first
55	Phase B current	1108	0x03	Float, high word first
56	Phase C current	1110	0x03	Float, high word first
57	Instantaneous total active power	1112	0x03	Float, high word first
58	Instantaneous phase A active power	1114	0x03	Float, high word first
59	Instantaneous phase B active power	1116	0x03	Float, high word first
60	Instantaneous phase C active power	1118	0x03	Float, high word first
61	Instantaneous total reactive power	1120	0x03	Float, high word first
62	Instantaneous phase A reactive power	1122	0x03	Float, high word first
63	Instantaneous phase B reactive power	1124	0x03	Float, high word first
64	Instantaneous phase C reactive power	1126	0x03	Float, high word first
65	Instantaneous total apparent power	1128	0x03	Float, high word first
66	Instantaneous phase A apparent power	1130	0x03	Float, high word first
67	Instantaneous phase B apparent power	1132	0x03	Float, high word first
68	Instantaneous phase C apparent power	1134	0x03	Float, high word first
69	Instantaneous total power factor	1136	0x03	Float, high word first
70	Instantaneous phase A power factor	1138	0x03	Float, high word first
71	Instantaneous phase B power factor	1140	0x03	Float, high word first
72	Instantaneous phase C power factor	1142	0x03	Float, high word first
73	Grid frequency	1144	0x03	Float, high word first