Most Large and several small Controllers use Specific Resistance Throttles. These Throttles are usually 0-5 or 5-0K Ohms.
The three wire Resistive Throttles Can be used as 0-5 or 5-0 depending on the two wires used. Some Controllers like the Kelly Models may use a 3 wire Resistive Throttle. Programmable controllers like the Alltrax can be Programmed to Accept just about any throttle Input but the Resistive type in most often used.