DUAL OUTPUT SENSE (DIRECTION) Dual outputs from any JC2000 industrial joystick axis can be configured during manufacture in one of two possible ways. These aredesignated within the joystick specification as same-ramp (P) or opposite-ramp (N). The diagrams, below, show dual outputs; for single output or a Z axis either output 1 or 2 can be chosen. The ramps at their lower end start at 25%, 20% or 10% of supply voltage and at their upper end finish at 75%, 80% or 90% of supply voltage, depending on output option. In the same-ramp configuration the outputs of an axis can be directlycompared to determine the serviceability of the joystick.In the opposite-ramp configuration the sum of the outputs from anyaxis should within limits, equal the applied voltage. DUAL OUTPUTS - X AND XY VERSIONS ONLY Each JC2000 joystick axis is equipped with two outputs and it is recommended that both outputs are continuously compared to ensure that the difference does not exceed the maximum specified difference plus a suitable safety margin’. In addition, machine movement should not be enabled until both outputs from any one axis exceed the centre threshold voltage plus a suitable safety margin’. (e.g. 2 x joystick centre tolerance) The outputs in normal use are within the maximum span limits shown on page 22. Any output significantly outside of this range must be regarded as erroneous and appropriate industrial safe action taken. A high value pull-up or pull-down resistance should be added to the X and Y outputs such that in the unlikely event of a wire or connector failure the output will be pulled out of range. CENTER TAP A center tapping is provided as a means of verifying the integrity of the supply voltage at the joystick. Clearly a high resistance or open circuit in either the +ve supply or 0V connections will affect the joystick outputs. The normal output at thecenter tap connection is 49% to 51% of the supply voltage. A center tap output outside this range indicates a fault in the supply to the joystick. SINGLE OUTPUTS - XYZ ONLY Where a JC2000 joystick incorporating only a single sensor per axis is used to control safety critical functions an independent momentary action system enable switch must be provided. OUTPUT IMPEDANCE OUTPUT NOISE The outputs at the center position and the end of travel are specified with an infinite load impedance or zero current. The effect of adding a finite load impedance will be to source or industrial sink current through the joystick output impedance. The voltage dropped through the joystick output impedance must be taken into account when the system threshold voltages are being defined. The impedance of the JC2000 outputs are specified on page 23. The JC2000 incorporates Hall effect sensors to detect the position of each of the joystick axes. A side effect of the use of thesesensors is electrical noise superimposed on the output, typically of the order of 20mV peak to peak. This noise can be simply filtered out by the user. MAGNETIC IMMUNITY Magnetic screening minimises the sensitivity to external magnetic fields. However the use of the joystick in close proximity to sources of high magnetic fields is not recommended. APPLIED VOLTAGES The JC2000 is designed to operate from a regulated 5Vdc ±0.5V supply, free from voltage transients. Under nocircumstances should voltages above 5.5V be applied to the joystick. The outputs from the JC2000 are ratiometric and are dependent on the input voltage.
Sum of outputs1 & 2SupplyVoltage Output 2 Max. differencebetween output 1 & 2Output 2Output 1 Same Ramp Opposite RampOutput 1 Max. difference sum to supply voltage

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