BLUE JAY BJ-MCM2401 Multi Channel Circuit Metering System User Guide
- May 15, 2024
- BLUE JAY
Table of Contents
BLUE JAY BJ-MCM2401 Multi Channel Circuit Metering System
Product Information
Specifications
- Product Name: Multi-channel Circuit Metering System BJ-MCM2401
- Communication Protocol: MODBUS
- Version: 1.2
- Max Distance for RS-485 Bus: 1,200m
- Maximum Connected Devices: 32 BJ194…
- RS485 PIN Numbers: 58, 59, 60
Product Usage Instructions
Connection for the RS485 BUS
The RS-485 cabling must be carried out with a meshed screen cable (minimum
3 wire), with a diameter of not less than 0.5mm2. Ensure the maximum distance
between the BJ194… and the master unit does not exceed 1,200m. Connect a
maximum of 32 BJ194… devices to the bus.
Note
- For communication with the master unit, customers can choose the RS-232 to RS-485 converter.
- Full range of BJ-… meter RS485 PIN numbers are 58, 59, 60.
- Interface pin placement may vary due to product modifications or custom requirements. Refer to the product label on the rear board for specific details.
FAQ
-
Q: What is the maximum distance for the RS-485 Bus?
A: The maximum distance for the RS-485 Bus is 1,200 meters. -
Q: How many devices can be connected to the RS-485 Bus?
A: A maximum of 32 BJ194… devices can be connected to the RS-485 Bus. -
Q: What are the RS485 PIN numbers for the BJ-… meter?
A: The RS485 PIN numbers for the BJ-… meter are 58, 59, and 60. -
Q: How can I communicate with the master unit?
A: Customers can choose the RS-232 to RS-485 converter for communication with the master unit.
Multi-channel Circuit Metering System
BJ-MCM2401
MODBUS register map
Version ：1.2
COMMUNICATION PROTOCOL
Connection for the RS485 BUS
The composition of the RS-485 cabling must be carried out with a meshed screen cable (minimum 3 wire), diameter of not less than 0.5mm2, with a maximum distance of 1,200 m between the BJ194… and the master unit. This Bus may connect a maximum of 32 BJ194…
Note
- For communication with the master unit, customers can choose the RS-232 to RS-485 converter to use
- Full range of BJ-… meter RS485 PIN number is 58,59,60
- Due to product modifications or custom requirements, the interface pin place may be changed. For details, please refer to product label on the rear board
MODBUS © protocol
Modbus RTU Frame Format
- Address code 1 BYTE Slave device address 1-247
- Function code 1 BYTE Indicates the function codes like read coils I inputs
- Data code 4BYTE
- Starting address, high byte
- Starting address, low byte
- Number of registers, high byte
- Number of registers, low byte
- Error Check code 2 BYTE Cyclical Redundancy Check (CRC)
MODBUS FUNCTIONS
Code: Meaning: Description:
- FUNCTION 03 Reading of n Words This function permits to read all the electrical parameters of the BJ 194 . . . series.
- FUNCTION 06 Preset single Registers Write value in to the relevant register
Register Map
Basic Power Data-Primary Side (Read only)
| Address | Data | Byte mode | Instruction |
|---|---|---|---|
| 0 | CH1- u | float | 2 |
| 2 | CH1- I | float | 2 |
| 4 | CH1 P | float | 2 |
| 6 | CH1_Q | float | 2 |
| 8 | CH1 S | float | 2 |
| 10 | CH1_PF | float | 2 |
0~1.000
12| CH1 FR| float| 2| Channel_1 Frequency,
Unit:0.01Hz
14| CH1 _ EpZ+| float| 2| Channel_1 positive active energy,
Unit: kWh
16| CH1_EpZ-| float| 2| Channel_1 negative active energy,
Unit: kVarh
18| CH1_EqZ+| float| 2| Channel1 positive reactive energy, Unit: kVarh
20| CH1 ** EqZ –| float| 2| Channel_ 1** negative
reactive energy,
Unit: kWh
22-42| CH2 parameter| float| 2| ** Structure refer to Channel 1
44-64| CH3 parameter| float| 2
. . . . . .| I| I| I
242-262**| CH12 parameter| float| 2
Meter status data, Read & Write (Disabled)
| Address | Data | Byte mode | Instruction | Status |
|---|---|---|---|---|
| 1200 | Digital output | int | 1 | 0: without act |
1 : active for trig
| R
1202| Alarm| int| 1| 0: without alarm 1: Alarm trigged Bit 0~4 show
Alarm 1~5 status| R
1203
| ****
DO working mode
| ****
int
| ****
1
| 0: Remote control
1 : Related to Alarm_1 2: Related to Alarm_2 3: Related to Alarm 3
4: Related to Alarm 4 5: Related to Alarm_5 6: trig to closed
7: triq to opened
| ****
R/W
1204
| ****
DO time delay
| ****
int
| ****
1
| In alarm mode: 0.0-999.9sec In remote control mode:
0 for Level output:
other value for pulse width 0.1-999.9sec
| ****
R/W
1240
| ****
Wiring mode
| ****
int
| ****
1
| 0: 3P4W
1: 3P3W-2CT
2: 3P3W-3CT
| ****
R
1241| Voltage range| int| 1| Unit: V| R
1242| Current range| int| 1| Unit: mA| R
1243| PT ratio| int| 1| Range: 1-9999| R
1244| CT of CH1| int| 1| Range: 1-9999| R
1245| CT of CH2| int| 1| Range: 1-9999| R
1246| CT of CH3| int| 1| Ranqe: 1-9999| R
1247| CT of CH4| int| 1| Range: 1-9999| R
Voltage harmonic (max 21th), Read Only
| Address | Data | Byte mode | Instruction |
|---|---|---|---|
| 1300 | THDU | int | 1 |
| 1301 | TOHDU | int | 1 |
| 1302 | TEHDU | int | 1 |
| … | I | I | I |
| 1310-1329 | HU | int | 1 |
Current harmonic (max 21th), Read Only
| Address | Data | Byte mode | Instruction |
|---|---|---|---|
| 1400 | THDl1 | int | 1 |
| 1401 | I | I | I |
| 1402 | I | I | I |
| 1403 | TOHDl1 | int | 1 |
0.1%
1404| I| I| I| Reserved
1405| I| I| I| Reserved
1406| TEHDl1| int| 1| Channel 1 Current even harmonic total distortion, unit
0.1%
1407| I| I| I| Reserved
1408| I| I| I| Reserved
1410-1429| Hl1| int| 20| Channel 1 Current harmonic ratio for 2 to 21th, unit
0.1%
1430-1459| CH2 Harmonic| int| 20| **** Structure refer to Channel 1
1460-1489| CH3 Harmonic| int| 20
….. .| I| II|
1730-1759| CH12 Harmonic| int| 20
Special operation (Disabled)
| Address | Data | Byte mode | Instruction | Status |
|---|---|---|---|---|
| 3000 | Reset energy counter | int I 1 | Send code | |
| 0x0A0A (DEC 2570) to clear all the enerov counter | w |
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www.cqbluejay.com
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