Rainbow Electronics DS1957 - Manual (Page 9)

DS1957
9 of 25
DATA TRANSFER AND CONTROL FUNCTION FLOW CHART Figure 4 (cont’d)
77H
START PROGRAM
?
N
BUS MASTER TX 6D43H
RELEASE SEQUENCE
COMMAND
UNDERSTOOD
?
BUS MASTER
RX 0
FROM DATA TRANSFER AND
CONTROL FUNCTION
Y
1)
FLOW CHART PART 4
FROM DATA TRANSFER AND
CONTROL FUNCTION
FLOW CHART PART 2
TO DATA TRANSFER AND
CONTROL FUNCTION
FLOW CHART PART 4
N
Y
TO DATA TRANSFER AND
CONTROL FUNCTION
FLOW CHART PART 2
1) TO BE TRANSMITTED OR RECEIVED AT OVERDRIVE SPEED IF OD=1
2) RESET PULSE TO BE TRANSMITTED AT OVERDRIVE SPEED IF OD=1;
RESET PULSE TO BE TRANSMITTED AT REGULAR SPEED IF OD=0 OR IF
THE DS1957 IS TO BE RESET FROM OVERDRIVE SPEED TO REGULAR SPEED
BUS MASTER TX 5D73H
RELEASE SEQUENCE
1)
BUS MASTER TX 92BCH
RELEASE SEQUENCE
1)
87H
CONTINUE PROG.
?
DDH
RESET MICRO
?
Y
COMMAND
UNDERSTOOD
?
COMMAND
UNDERSTOOD
?
BUS MASTER ENABLES
STRONG PULLUP
DS1957 RUNS
UNTIL ALARM
BUS MASTER DISABLES
STRONG PULLUP
BUS MASTER
RX 1
BUS MASTER
RX 1
BUS MASTER
RX 0
MICROCOMPUTER
IS RESET
COMMAND
UNDERSTOOD
?
1)
1) 1)
1)
N N N Y Y Y
N Y
N
BUS MASTER
TX RESET
?
N
Y
BUS MASTER
RX 1’s
BUS MASTER
RX 0’s