Linx Technologies CMD-HHCP-xxx - Manual (Page 5)

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Setting the Transmitter Address
The Compact Handheld transmitter
allows the selection of one of 1,022
unique addresses. All transmitters are
supplied set to the same address. To
avoid contention with other units or to
create unique relationships, the address
can be changed. This is accomplished
using internal DIP switches as shown.
The switches are accessed by
removing the DIP switch access cover
on the back of the transmitter.
If the switch is on, the address line
is connected to ground, otherwise it is
pulled to supply. The receiver’s address
must match exactly in order for the units to communicate. Application Note
AN-00300 describes in detail how to set the address to match any of the
receivers offered by Linx. This note can be found in the Support section of
the Linx website, www.linxtechnologies.com.
Button Assignments
Figure 7 illustrates the relationship between the button locations and
encoder data lines.
OFF ON
A0 = 1
A1 = 2
A2 = 3
A3 = 4
A4 = 5
A5 = 6
A6 = 7
A7 = 8
A8 = 9
A9 = 10
D7 D6
D5 D4
D3 D2
D1 D0
Figure 6: DIP Switch Assignments
Figure 7: Button Assignments
Protocols
The DS Series encoder inside the Compact Handheld transmitter supports
two protocols. The first protocol is based on the Holtek HT640 encoder
and is completely backwards compatible with older generation transmitters
and systems based on the HT658 decoder. The second is a serial protocol
that offers more noise immunity and faster response time while keeping the
simple addressing.
The transmitter can use only one protocol at a time. The protocols do not
work together.
The protocol is selected with a switch next to the battery. Figure 5 shows
this switch.
If the switch is toward the top then the Holtek protocol is selected. If the
switch is toward the bottom then the serial protocol is selected.
Figure 5: Protocol Selection Switch
Note: Setting all of the DIP switches on or all of them off are not valid
addresses. At least one switch must be different from the rest.