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Forlong DRS 202C, DRT 301C MODBUS registers: read online

Connect Forlong to the computer through a USB-to-serial or RS485 adapter and read its registers in your browser: click "Read register values online" under the model (Chrome or Edge, nothing to install). The tables below list the MODBUS offset, unit, data type and scale of every register shown. For logging 24/7 into a database, CSV files or Excel, use the Advanced Serial Data Logger (for MODBUS RTU) or Advanced TCP/IP Data Logger (for MODBUS TCP): they poll the complete map of every model on this page and provide continuous Forlong modbus logging and log.

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Forlong (DRS 202C,DRT 301C) - MODBUS Measurements

Connection and addressing notes

Protocol
Modbus (protocol V3.0.1)
Function codes
03, 04, 06, 10, 11
Address register
0x000F, read/write, function codes 03 and 10
Baud rate register
0xF800, write only, function code 10
Baud rate register values
0x0001 = 1200, 0x0002 = 2400, 0x0003 = 4800, 0x0004 = 9600 bps

Registers in the map: 1. function 3 (holding registers). byte order big-endian. data types: dword.

MODBUS offsetDescriptionUnitsData typeScale
286Active energykWdword 

Forlong (DRS 202M) - MODBUS Maps

Connection and addressing notes

Protocol
Modbus (protocol V3.0.2)
Measurement access
function code 04, 4-byte float values
Address register
0x0524, read/write, function codes 04 and 06
Baud rate register
0x0525, read/write, function codes 04 and 06
Baud rate register values
hex 0x04B0 = 1200, 0x0960 = 2400, 0x12C0 = 4800, 0x2580 = 9600

Registers in the map: 11. function 4 (input registers). byte order big-endian. data types: single, string.

MODBUS offsetDescriptionUnitsData typeScale
16Voltage L1Vsingle 
78FrequencyHzsingle 
80Current L1Asingle 
82Current L2Asingle 
88Current totalAsingle 
352Import active energykWsingle 
2026Channel 1 energy rate 1kWsingle 
2028Channel 2 energy rate 2kWsingle 
2034Channel 2 energy rate 1kWsingle 
2036Channel 2 energy rate 2kWsingle 
64512Date and time stringformula

Forlong (DRT 301C-II) - MODBUS Registers

Connection and addressing notes

Protocol
Modbus (protocol V3.0.3)
Measurement access
function code 04, 4-byte float values
Address register
0x0524, 16 bit, read/write, function codes 04 and 06
Baud rate register
0x0525, 16 bit, read/write, function codes 04 and 06
Baud rate register values
hex 0x04B0 = 1200, 0x0960 = 2400, 0x12C0 = 4800, 0x2580 = 9600

Registers in the map: 31. function 4 (input registers). byte order big-endian. data types: single, string.

MODBUS offsetDescriptionUnitsData typeScale
1318Serial number stringformula
16Voltage L1Vsingle 
18Voltage L2Vsingle 
20Voltage L3Vsingle 
78FrequencyHzsingle 
80Current L1Asingle 
82Current L2Asingle 
84Current L3Asingle 
86Current neutralAsingle 
88Current totalAsingle 
144Power L1kWsingle 
146Power L2kWsingle 
148Power L3kWsingle 
150Power totalkWsingle 
208Apparent power L1kVAsingle 
210Apparent power L2kVAsingle 
212Apparent power L3kVAsingle 
214Apparent power totalkVAsingle 
272Reactive power L1kvarsingle 
274Reactive power L2kvarsingle 
276Reactive power L3kvarsingle 
278Reactive power totalkvarsingle 
336Power factor L1 single 
338Power factor L2 single 
340Power factor L3 single 
342Power factor total single 
352ImportkWsingle 
358Export energykWsingle 
1560Total energykWsingle 
354Import reactive energykvarsingle 
360Export reactive energykvarsingle 

Forlong (DRT 301M) - Measurement Data

Connection and addressing notes

Protocol
Modbus (protocol V3.0.4)
Measurement access
function code 03, hex (word) data format
Baud rate register
0xF800, write only, function code 10
Baud rate register values
0x0001 = 1200, 0x0002 = 2400, 0x0003 = 4800 bps
Baud rate register duplicate value
0x0002 is printed again for 9600 bps

Registers in the map: 288 (the first 50 are listed below; the browser reader and the data loggers use the complete map). function 3 (holding registers). byte order big-endian. data types: dword, string, string(30).

MODBUS offsetDescriptionUnitsData typeScale
62976Meter number dword 
16Voltage L1Vdword 
18Voltage L2Vdword 
20Voltage L3Vdword 
78FrequencyHzdword 
80Current L1Adword 
82Current L2Adword 
84Current L3Adword 
86Current neutralAdword 
144Power L1kWdword 
146Power L2kWdword 
148Power L3kWdword 
150Power totalkWdword 
208Apparent power L1kVAdword 
210Apparent power L2kVAdword 
212Apparent power L3kVAdword 
214Apparent power totalkVAdword 
272Reactive power L1kvardword 
274Reactive power L2kvardword 
276Reactive power L3kvardword 
278Reactive power totalkvardword 
336Power factor L1 dword 
338Power factor L2 dword 
340Power factor L3 dword 
342Power factor total dword 
352Import energykWdword 
358Export energykWdword 
2000Import energy rate 1kWdword 
2002Import energy rate 2kWdword 
2004Import energy rate 3kWdword 
2006Import energy rate 4kWdword 
2256Export energy rate 1kWdword 
2258Export energy rate 2kWdword 
2260Export energy rate 3kWdword 
2262Export energy rate 4kWdword 
61440Time stringformula
61713Last 1 month positive energy, totalkWdword 
61715Last 1 month positive energy, rate 1kWdword 
61717Last 1 month positive energy, rate 2kWdword 
61719Last 1 month positive energy, rate 3kWdword 
61721Last 1 month positive energy, rate 4kWdword 
61729Last 2 month positive energy, totalkWdword 
61731Last 2 month positive energy, rate 1kWdword 
61733Last 2 month positive energy, rate 2kWdword 
61735Last 2 month positive energy, rate 3kWdword 
61737Last 2 month positive energy, rate 4kWdword 
61745Last 3 month positive energy, totalkWdword 
61747Last 3 month positive energy, rate 1kWdword 
61749Last 3 month positive energy, rate 2kWdword 
61751Last 3 month positive energy, rate 3kWdword 

This is not the complete map: 50 of 288 registers are listed above. Click "Read register values online" to read any register of your device in the browser, or download the program to log the complete map.

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Note: Products and companies mentioned here are used only for definition and identification purposes and can be trademarks and/or registered trademarks of the respective companies.

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