HW group Poseidon B-Cable

The RS-485 bus is used for connection of sensors to the Poseidon for up to 1 000 meter distance. It is connected with 4 wires (A, B, +, -) or using an RJ45 connector. The B-Cable module converts these two ways of connection.

This cable will be very helpful for easy conversion from 4-pin to RJ45 wiring used when connecting the Temp-485-Pt100 or HTemp-485 sensor types to the S-Hub or to Poseidon itself (model 1250 and higher).

Note:
B-Cable represents a cheap solution and is intended for instalation in distribution box or other narrow spaces. For this reason it is supplied without any box as depicted here.

Connecting the B-Cable to sensors

RJ45 connected over B-Cable to the Temp-485 sensorOn the picture you can see a connection of the B-Cable to the Temp-485 temperature sensor. The B-Cable needs to be connected using 4 wires, both connection blocks have the same description.
Don´t use termination on the sensor, not even in the situation that the sensor is the last one. Use the jumper configuration "MIDDLE / LAST" instead.


Connection without the B-Cable

The B-Cable is not necessary when connecting sensors to the terminal board. You can use direct TP cable connection instead.

Note: The direct connection is recommended for installation companies and experienced users!


To connect sensor that is not at the end (so it´s MIDDLE) you must connect the green and the blue wire of the TP cable on the sensor´s connector - as you can see on the picture. Be careful, you always connect full colour with striped colour.

The RS-485 terminator on the sensor is disabled (TERM=OFF)

About 0,5 meter long cable connected this way can be ordered under the following code:
Sensor RJ45 MIDDLE cable [600 233]

The LAST sensor uses a simple connection of 4 wires. The proper connection of the power supply is signalized by an indicator, that will blink when the power supply is properly connected.

The RS-485 terminator on the sensor is enabled (TERM=ON)

About 0,5 meter long cable, connected this way can be ordered under the following code:

Sensor RJ45 LAST cable [600 234]



Ordering numbers

600 044	Poseidon B-Cable	RS-485 converter from 4 terminal pins (A, B, +, - ) to conector RJ45
600 041	Poseidon S-Hub	Splitter for up to 8 sensors to RS-485 bus (8+1x RJ45)
600 233	Sensor RJ45 MIDDLE cable	RS-485 cable 0.5m, RJ45/4 pins to connect 4 terminal pins (A, B, +, - ) to connector RJ45 (3 pairs)
600 234	Sensor RJ45 LAST cable	RS-485 cable 0.5m, RJ45/4 pins to connect 4 terminal pins (A, B, +, - ) to connector RJ45 (2 pairs)