S
Dear All,
I have a project where I would like to convert Modbus to 4…20mA.
I have the following items: receiver,a reader Modbus master, and a converter from Modbus to 4…20mA.
The connections are made as follow:
A sensor is connected to a transmitter that will send the data wirelessly to a receiver with Modbus output.
Reader connection:
1- RS485 Slave: 3 pins: A,B,GND
2- RS485 Master: 3 pins: A,B,GND
3- Power Supply: 2 pins: 10…40VDC, 19…28VAC
Converter Connection:
1- RS485 : 3 pins : A,B,GND
2- 4…20mA: 2 pins: OUT, GND
3- Power Supply: 2 pins: 10…40VDC, 19…28VAC
4- DIP Switches: to define the Baud Rate, and the address
5- Termination: On, or Off
Receiver Connection:
Wire RS-485 cable------- Fieldgate------- terminal Remarks
RxD/TxD– (RS-485 A) ------- A------- RS-485 differential
RxD/TxD+ (RS-485 B) ------- B------- signal
Shield -------SHD------- Cable shielding
Dip Switches: to define the Bus address, baudrate, RS485 termintaiton
Power Supply: 1,2 : 24VDC
Ethernet connection to connect the receiver to a network TCP-IP
I am a little bit confused how to connect these three items:
As I know that the reader is the Master device and the converter is slave. Is this true? If so, how should I connect them?
Output of the receiver RS485 is connected to Slave connection of the Reader.
The Master connection of the reader is connected to the connection of the converter.
Can you please guide us if this is true? Or the connection should be swapped?
Thank you in advance.
I have a project where I would like to convert Modbus to 4…20mA.
I have the following items: receiver,a reader Modbus master, and a converter from Modbus to 4…20mA.
The connections are made as follow:
A sensor is connected to a transmitter that will send the data wirelessly to a receiver with Modbus output.
Reader connection:
1- RS485 Slave: 3 pins: A,B,GND
2- RS485 Master: 3 pins: A,B,GND
3- Power Supply: 2 pins: 10…40VDC, 19…28VAC
Converter Connection:
1- RS485 : 3 pins : A,B,GND
2- 4…20mA: 2 pins: OUT, GND
3- Power Supply: 2 pins: 10…40VDC, 19…28VAC
4- DIP Switches: to define the Baud Rate, and the address
5- Termination: On, or Off
Receiver Connection:
Wire RS-485 cable------- Fieldgate------- terminal Remarks
RxD/TxD– (RS-485 A) ------- A------- RS-485 differential
RxD/TxD+ (RS-485 B) ------- B------- signal
Shield -------SHD------- Cable shielding
Dip Switches: to define the Bus address, baudrate, RS485 termintaiton
Power Supply: 1,2 : 24VDC
Ethernet connection to connect the receiver to a network TCP-IP
I am a little bit confused how to connect these three items:
As I know that the reader is the Master device and the converter is slave. Is this true? If so, how should I connect them?
Output of the receiver RS485 is connected to Slave connection of the Reader.
The Master connection of the reader is connected to the connection of the converter.
Can you please guide us if this is true? Or the connection should be swapped?
Thank you in advance.