![]() When the keypad is configured in Wiegand mode, the keypad data is sent as a complete Wiegand data packet, as though you presented a card. The keypad supports the following Wiegand formats (parameter 10). Note: This does not reset the keypad operating mode. All access control functionality should be programmed and remain separate from the Panic Output functionality. This output should not be used to gain access. This is used in case of emergency to activate an auxiliary alarm device, such as a siren, that is used to indicate an emergency condition only. *Note: The Panic Output is activated by pressing the * and # keys at the same time. Note: The default setting for both settings is 0. Note: Refer to the Wiegand Format Chart below for parameter 8. Flight Systems offers a repair/rebuild program for this unit.12 – Wiegand Interpulse Spacing 1 – 255 ( default = 32, 640µS) Carefully disconnect the other wires and then remove the mounting screws and wire ties. Unplug the temperature sensor and keypad cables. Before removing the box for service, make sure the power is off and take a digital photo of the wiring connections. NOTE 2: The power/logic board and other associated components are housed in a metal box located on the central unit (compressor). Flight Systems offers a repair/rebuild program that features a completely new upgraded keypad with extended life and an improved tactile feel. ![]() Carefully remove the keypad from the bulkhead and unplug the four-pin connector. To remove the keypad, lift up on the bottom edge of the plastic bezel. For diagnostic purposes, the keypad assembly can be easily swapped out with a known good one from another part of the boat (or borrowed). This problem is caused by tiny “whiskers” that grow between the contacts of the UP membrane switch. Occasionally, the UP temperature button will make contact by itself, thereby running the set temperature up to the maximum, with the result of shutting down the A/C and possibly turning on the heat. This is usually due to cracks developing in the flexible circuit traces which are an integral part of the membrane switch portion of the keypad assembly. One or more functions may become erratic or inoperative. NOTE 1: The SMX II keypad can fail in several different ways, each presenting certain symptoms. Check for leaks in water loop and/or piping.Make sure insulation around ducting is not missing or compressed.Make sure hose is routed downhill for drainage.Check/clean out condensate drain pan and fittings.SYMPTOM: Water dripping inside cabin or compartment. Repair or replace SMX power/logic board (see NOTE 2 below).Repair or replace SMX keypad assembly (see NOTE 1 below).Check change-over thermostat in air handler (if equipped).Check CX/CXP cable (power/logic to keypad) and connections.Repair or replace power/logic board (see NOTE 2 below). ![]() Use UP or DOWN to adjust sensed temperature to match actual temperature as measured at air return. Calibrate temperature: Press OFF then SET.Make sure the temperature sensor is installed properly in air return.Check temperature sensor, cable and connection.Perform a Factory Memory Reset (Press OFF/SET/FAN together, then SET). ![]() SYMPTOM: Erratic or Erroneous SMX Temperature Display.
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