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Pin Function T-568A T-568B
1 RS485 +ve Green/white Orange/white
2 RS485 -ve Green Orange
3 Digital input 3 Orange/white Green/white
4 Analogue input Blue Blue
5 0V DC ground Blue/white Blue/White
6 Digital input 2 Orange Green
7 Digital input 1 Brown/white Brown/white
8 24V Brown Brown
Check that the cable you use has the above colour coding pins 1 through to 8. If an alternative colour coding
has been used make sure to record the colour which corresponds to each pin to avoid misconnection at
the pool controller or heater. If an alternative cable is used make sure the analogue input and ground are a
twisted pair.
The 24V connection is only to be used as a reference for the digital inputs – DO NOT power external
equipment from this supply rail.
Digital control inputs
The 3 digital inputs allow for overriding the dial speed setting. To set one of these inputs either:
• Connect an isolated 24V supply between DC ground and the digital input pin
• Connect the switched contacts of a relay between the 24V pin and the digital input
The fixed speeds (as a proportion of full speed) are:
Input 1 (Pin 7) Input 2 (Pin 6) Input 3 (Pin 3) Output Speed
0 0 0 Dial
0 0 24V 33%
0 24V 0 50%
0 24V 24V Backwash
24V 0 0 100%
24V 0 24V 67%
24V 24V 0 83%
Interfacing equipment to the SilensorPRO SP400BT
WARNING! A qualied electrician is required to carry out the work shown below.
The SilensorPRO SP400BT can be controlled by other equipment to turn it on to high speed (or any other
pre-set speeds, see section 8 for details). This is to achieve maximum efficiency, for example, when using a
gas heater, or a heat pump. If the equipment has an isolated 18- 24V DC signal output, simply connect pin 7
to 24V DC positive and pin 5 to DC ground as shown in the following diagram:
Pin7 (Brown/White)
Pin5 (Blue/White)
+ 18 ~ 24V DC
DC Ground
Controlling Equipment
To RJ45 Socket of VSD Pump
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