Service manual

DCB, DCFCB and DCFCTB Models
37
Theory of Operation
Table 3 Function currently running
DTMF
Character
Function
0
Standby
1
Function 1
2
Function 2
3
Function 3
4
Function 4
5
Function 5
6
Function 6
Decoding sensor status
Sensor status decoding using the DTMF digit to BCD reports current sensor
status. Depending on the type of unit selected the sensors required vary.
Table 4 Digit 7
Digit 7
DCB or 2001AC
Single Motor Siren
Three Motor Siren
Bit 1
(LSB)
Rotation
N/A
Rotation
Bit 2
Intrusion
Intrusion
Intrusion
Bit 3
Not used, always 0
Not used, always 0
Not used, always 0
Bit 4
AC power
AC power
AC power
Table 5 Digit 8
Digit 8
DCB or 2001AC
Single Motor Siren
Three Motor Siren
Bit 1
Battery voltage*
Battery voltage*
Battery voltage*
Bit 2
AUX 1
AUX 1
Blower motor
Bit 3
Activation current
Activation current
Activation current
Bit 4
Local activation
Local activation
Local activation
* Battery voltage refers to the 48V siren voltage.
Table 6 Bit Status
0
1
Rotation did occur
Rotation did not occur
Cabinet door is closed
Cabinet door is open
AC power is ON
AC power is OFF
AUX 1 closed
AUX 1 open
Blower did operate
Blower did not operate
Activation current
detected
Activation current not detected
Battery voltage okay
Battery voltage low
Local activation occurred
Local activation did not occur