Rotary Code Switches
Abrasion resistant hard gold plating
Galvanic Gold plating of contacts. Abrasion resistant hard gold plating on contact pins in Hartman Codier rotary code switches is aprox. 1.2µm thick, with min. thickness of 0.8µm.
Contacts with hard gold plating show considerable abrasion after 30 000 steps, whereas on commonly used flash gold contacts gold is completely gone after 10 000 steps.
Gold plating not only serves for better conductivity of contacts, but also as an anticorrosive between operations. So if flash gold on contacts is gone, they will more likely corrode than hard gold plated contacts. Therefore on Hartmann Codier rotary code switches hard gold plating is a standard.
Number of Pins of rotary code switches. Hartmann Codier rotary code switches generally have two kinds of connection systems available. The 3+3 pinning systems have one common connection pin ("C") and two outgoing pins on each side. The common connection pin is the input contact and is either the center pin or a lateral pin. Switches with 3+2 pins, that have one common contact only (1xC), are available on request. The 4+1 pinning system has one common connection pin on one side and four outgoing pins on the other.
Round element in the center of a rotary code switch that is used to operate the switch and set the code to a certain position. Basic versions come with arrow shaped slots or cross shaped slots. Additional actuators can be snapped into the cross shaped slots (not applicable for cross shaped slots of P36 series). Most additional actuators are not suitable for eflow soldering. They have to be ordered seperately and snapped into the cross shaped slot after soldering process. Additional actuators suitable for reflow soldering are available on request.
The code defines which output contact gets a signal at a certain actuator position. There are many different standard codes available as well some special codes.
Common contact / C-contact
The input signal pin on rotary code switches. This can be one or two pins. Switches with two C-contacts have one C-contact on each side, which are connected.
Rotary code switch
A rotary code switch switches input signals from the common C-contact to the different output contacts. The code defines which output contact gets a signal at a certain actuator position. There are available as well some special codes. Rotary code switches are available with many different standard codes are ideal for setting addresses in bus systems or wireless applications as well as for setting parameters on any electrical device. The height Hartmann Codier rotary code switches defines the switch name, e.g. the P25 is 2.5mm high.
Gray-Codes are continuing codes for safety applications. Compared to standard hexadecimmal codes each position changes only one digit. That limits possible reading errors to one. However operating 10 position Gray-Codes between position 9 and 0 will change more than one digit. To solve this problem, we have a so called Safety-Gray-Cod, where coding has been changed in position 0.