Service manual

DCB, DCFCB and DCFCTB Models
Theory of Operation
36
Software Description of DCFCTB 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.
Digit #
Description
1
Start Character, always a DTMF ―*‖
2
Unit type programmed into unit (see unit types)
3
Function status (see function currently running)
4
unit number: BCD most significant digit
5
unit number: BCD middle digit
6
unit number: BCD least significant digit
7
BCD of sensor status: (see decoding of sensor status)
8
BCD of sensor status: (see decoding of sensor status)
9
Terminating Character ―*‖
Table 1 Conversion of DTMF Digit to BCD
DTMF
Character
BCD equivalent
1
0 0 0 1
2
0 0 1 0
3
0 0 1 1
4
0 1 0 0
5
0 1 0 1
6
0 1 1 0
7
0 1 1 1
8
1 0 0 0
9
1 0 0 1
0
1 0 1 0
*
1 0 1 1
#
1 1 0 0
A
1 1 0 1
B
1 1 1 0
C
1 1 1 1
D
0 0 0 0
Table 2 Unit Types
DTMF
Character
DCFCTB types
A
Single motor mechanical
B
Three motor mechanical
C
2001AC or DCB