Connecting RS485 Devices


The product is suitable for the communication with RS485 devices via Modbus RTU.

The bytes in the product are set as follows and may need to be adjusted in the RS485 device.

Structure:

8 data bits

1 stop bit

No parity

Cable requirements:

The cable length and quality affect the quality of the signal. Observe the following cable requirements.

  • Number of insulated conductor pairs and insulated conductor cross-section: at least 2 x 2 x 0.22 mm² (2 x 2 x 24 AWG)

  • Maximum cable length across the entire RS485 bus: 1200 m (3937 ft)

  • Twisted pair conductors

  • Shielding: yes

  • UV-resistant for outdoor use.

Plug assignment:

Plug

Position

Assignment

1

Data+ (D+)

2

Not assigned

3

Ground (GND)

4

Data- (D-)

5

Line termination (optional)

6

Line termination (optional)

Requirements:

  • The same baud rate (1200 baud, 9600 baud or 19200 baud) must be set in all RS485 devices.

Procedure:

  1. Dismantle 40 mm of the product end of the RS485 cable.
  2. Strip the shielding to the same length as the cable sheath.
  3. Shorten unused insulated conductors flush with the cable sheath.
  4. Strip off the conductor insulation by 6 mm.
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  6. Release the conductor entries on the supplied six-pole plug.
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  8. Connect the RS485 data cable conductors to the supplied six-pole plug. To do so, plug the conductors into the conductor entries and close the conductor entries. Observe the plug assignment.
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  10. If the product is at the end of the RS485 bus, install a jumper wire as a line terminator between pin 5 and pin 6 on the six-pole plug.
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  12. Plug the six-pole plug into the port X2 on the product.