Here is some info from The CIS 2003 newsletter We have recently found there to be an issue with ?Loss of Communications? specifically on the Homeminder LED Keypad ( Cat # 5208 ), however this could possibly affect the Homesafe keypads. This problem is caused by using ?twisted pair type? cables and wiring the ?CLK? and ?DATA? using paired conductors. This ?pairing? effectively cancels out any transmitted signal on the paired conductors. For the LED Keypad we recommend security type cable to be used (which does not have twists on individual pairs). Currently it is only installers who use CAT5 or similar constructed cables that are experiencing some communications problems. To prevent this occurrence you must: ī Use ?Security type? cable, or ī Wire the ?CLK? and ?DATA? on conductors that are not paired together. We have also seen documentation to this effect for another security manufacturers LED keypads
