Coded switches offer binary and Gray encoding

18 April 2007 Switches, Relays & Keypads IoT & Automation

Lorlin Electronics offers a wide range of coded rotary switches for control and programming functions. The standard BCK series offers 16 positions of binary encoding or complementary hexadecimal versions.

The contacts in conventional binary coded switches produce a standard binary count as the contact disc rotates. However, there is a drawback in that if the disc stops between two adjacent sectors, or the contacts are not perfectly aligned, it can be impossible to determine the angle of the shaft and an incorrect code may be read.

To overcome this problem, the 8 position GCK family of Gray coded switches is available. Gray encoding is a system of binary counting in which two adjacent codes differ in only one position. With Gray coding switching transitions only one of the contacts has to change its state from on to off or vice versa. This avoids the potential of incorrect code sequences that may be possible from conventional binary coded mechanisms.

The BCK and GCK offer contacts rated at 150 mA at 50 V AC/DC, operational life greater than 10 000 cycles, operating temperature -30 to 85°C, 250 V a.c. proof voltage and contact resistance of less than 50 mΩ.

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