Service manual

29
Functional Description
DCB, DCFCB and DCFCTB Models
JP10
Pin-out
Pin #11
FUNCTION #1
Pin #12
common
Control Board Power Input
The controller has a 115 VAC power input. The DCFCB and DCFCTB may be
ordered with the –240B option to enable operation from 208-240 VAC. The AC
selection switch (S7) on the control board must always be set to the 110 VAC
position. When the proper voltage is applied, the “POWER” LED is lit. Refer to the
Installation section on page 48 for installation details.
DTMF Decoding and Encoding Formats
Decoding Format
DTMF
The DCFCTB decodes any valid 3 to 12 digit DTMF string with timing of 50/50 to a
total mark/space time of 800 milliseconds. Faster DTMF decode timing, down to
35/5 ms, is available but you need to specify when ordered. When stacking multiple
DTMF strings together, a 1250 millisecond spacing is needed before and after a valid
DTMF string for proper decoding. Otherwise, the decoder disregards the string.
Two-Tone
The DCFCTB decodes two-tone codes with tone accuracy within 1.5%. Timing must
be at least 80% of what has been programmed. The inter tone gap must be less than
400 milliseconds. The recommended minimum tone spacing is 5%. You can use tone
timings between 0.5 seconds and 8 seconds for the A tone and between 0.25 seconds
and 8 seconds for the B tone.
DTMF Encoding Format
The DCFCTB encodes a nine (9) digit DTMF string that includes the RTU’s unit
type, id number, function status and sensors status. Refer to the Software Description
of DCFCTB Encoding Format section on page 36 for detailed information.