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there is only one entry phone on the DCH4. Program the DCH4 with “0#62 ”(disable entry phone
ringing). When the doorbell chimes, picking up a house phone will instantly connect the house phone
to the entry phone. If the user presses the doorbell switch again while their call is either ringing the
house phones or while talking to the house, the auxiliary relay will activate each time they press the
doorbell switch (causing the doorbell to chime again).
With the DCH4 in the auxiliary contact mode (DIP switch 1 OFF), the auxiliary contact output can be
programmed (see Programming section B) to activate in 3 different patterns when entry phones 1-4
are off-hook. These patterns include a momentary activation, a continuous activation while the entry
phone is in use, and a ring cadence pattern. A fourth programmed setting is also available for a timed
activation of the auxiliary relay from a contact closure.
2. Auxiliary Contact Mode (DIP Switch 1 OFF)
a. Entry Phone Triggered Timed Activation (0.5 second factory default with DIP switch 1
OFF) With the entry phone triggered timed activation programmed (1 followed by #60), when
any entry phone is activated, the auxiliary contacts will activate for the programmed time (0.5 -
99 seconds) in memory location #59 (see section M below).
b. Entry Phone Triggered Continuous Activation
With the entry phone triggered continuous activation programmed (2 followed by #60), when
any entry phone is activated, the auxiliary contacts will activate continuously (latch) until the
entry phone disconnects. This is ideal for controlling video cameras, lights, etc. In this mode
only, when a house phone has dialed a monitor command (#1, #2, #3 or #4) to connect to an
entry phone, the DCH4 will latch the auxiliary relay during the “monitor” once the entry phone
answers (so a camera or light can be activated while monitoring.
c. Entry Phone Triggered Ring Cadence Activation
With the entry phone triggered ring cadence activation programmed (3 followed by #60), when
entry phone 1 is activated, a repeating 1 second on and 3 seconds off auxiliary contact pattern
is generated. When entry phone 2, 3, or 4 is activated, a repeating double burst contact pattern
is generated with 3 seconds off between patterns. The auxiliary contact pattern stops when the
house phone answers the call from the entry phone. This is ideal for controlling visual ring
indicators, or connecting to a model DPC100 for unique front and back door chimes.
d. Auxiliary Input Triggered Timed Activation
With the auxiliary input triggered timed activation programmed (4 followed by #60), a
momentary contact closure on the DOORBELL/AUX INPUT will activate the auxiliary contacts
for the programmed time (0.5 - 99 seconds in memory location #59, see section M below). The
auxiliary contacts may be used to provide an additional relay or may be used to add doorstrike
entry to an entry phone that does not have a Touch Tone keypad. The auxiliary input contacts
may also be used for timed operation of other devices such as yard lights, etc. and can be
triggered by the second set of door entry contacts (available through solder pads on the DCH4
PCB).
M. Auxiliary Contact Timing
To program the length of time the “AUXILIARY CONTACT” is activated when triggered from an entry
phone or the “AUX INPUT”, enter 00 - 99 followed by #59.