The Linx OEM product line is broken into three families based on the encoder that is used: HS, MS, and Holtek. These families are not compatible with each other. The HS and MS-based products set the address with the press of a couple of buttons. The Holtek-based products are a little more complicated.

The Holtek encoder and decoder ICs offer ten address lines, not all of which are used by all of the OEM products. The address lines are tri-state meaning that they have three distinct input states: ground, Vcc and floating. These address lines must be in the same states on both the encoder and decoder in order for the transmission to be validated. The OEM products all use the ground and floating states, set with a series of DIP switches. When the switch is on, the line is connected to ground, otherwise it is left floating.

The Full-Size Handheld transmitter (CMD-HHTX-xxx) uses only the first eight address lines (A0 through A7) via an eight-position DIP switch located inside the case. The last two lines are left floating so the receiver must have these lines (A8 and A9) floating as well. One important thing to note is that DIP Switch number 1 is connected to address line A7, switch 2 to line A6 and so forth.

The Compact Handheld transmitter (CMD-HHCP-xxx) and Long Range Handheld transmitter (CMD-HHLR-xxx) both use all ten address lines via a ten-position DIP switch on the back of the case. DIP switch number 1 is connected to address line A0, switch 2 to line A1, etc.

The Keyfob transmitter (CMD-KEY#-xxx) uses all ten address lines via ten cut-traces located above the Holtek chip on the circuit board. These lines are routed to ground and should be cut to make floating. These traces are numbered according to the address line number.

The Function Relay Module (FCTN-RLY4-xxx) uses the first eight address lines (A0 through A7) via an eight-position DIP switch located on one side of the case. The last two address lines (A8 and A9) are left floating, so the transmitter must leave these lines floating as well. One important thing to note is that DIP Switch number 1 is connected to address line A7, switch 2 to line A6 and so forth.

The AC Module (FCTN-WALL-xxx) uses only four of the address lines (A0 through A3) via the bottom four DIP switches located on the side of the module that plugs into the wall. The other six address lines (A4 through A9) are left floating so the transmitter must have these floating as well. DIP switch number 1 is connected to address line A0, switch 2 to line A1, etc.

More detailed information on setting the addresses is available in Application Note AN-00300 and in each of the data guides for the OEM products. All of these documents can be downloaded from our web site.

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