© 2000 CONTRIVE • B1401.EN 0211 12 www.contrive.it
CHECKSUM CALCULATION
Each command must include a valid checksum KK to be
executed, all the answers will include a valid checksum
KK that can be optionally evaluated by supervisor.
KK is the ASCII figure of the sum of all characters HEX
values, including Carriage Return. See example and use
only last two characters, ignoring trailing ones (if any).
< 0 8 S 04 <Cr> < Equals HEX 3C +
0 Equals HEX 30 +
1 Equals HEX 38 +
S Equals HEX 53 +
<Cr> Equals HEX 0D =
ASCII 104
COMMAND LIST
H BURNER HALT Q SHUTDOWN THE BURNER
R BURNER RUN Q RESTART THE BURNER FROM SHUTDOWN
B UNLOCK Q RESET THE BURNER FROM LOCKOUT, MUST BE CONFIRMED §1
Y UNLOCK CONFIRM Q CONFIRM THE RESET FROM LOCKOUT
E EXTEND Q FORCE THE BURNER TO PREPURGE UNTIL A ‘COMPLETE’ COMMAND IS RECEIVED §2
C COMPLETE Q COMPLETE THE PREPURGE TIME
S STATUS Q NO ACTION BUT STATUS REQUEST
§1 THE SUPERVISOR MUST SEND A RESET CONFIRMATION WITHIN 25 SECONDS FROM PERIPHERAL ACKNOWLEDGE TO RESET COMMAND.
AN UNCONFIRMED RESET COMMAND WILL BE CANCELLED AFTER 25 SECONDS. RECEIVING AN ILLEGAL RESET COMMAND (i.e.: RESET
WHILE NOT IN LOCKOUT) A LOCKOUT WILL BE FORCED TO PREVENT DANGEROUS OPERATION.
§2 RECEIVING AN EXTEND COMMAND THE BURNER IS FORCED TO PREPURGE, IF THE BURNER IS RUNNING IT WILL BE TURNED OFF
PERFORMING A COMPLETE RECYCLE INCLUDING SELF TEST. WHEN A ‘COMPLETE’ COMMAND IS RECEIVED, THE REMAINING PREPURGE
TIME (IF ANY) WILL BE COMPLETED PROCEEDING TO NEXT CYCLE STEP.
STATUS LIST
S STOP Q BURNER LOCKOUT OR FAILURE
0 MANUAL SHUTDOWN Q BURNER OUT OF SERVICE, SHUTDOWN FROM LOCAL PUSH BUTTON
H HALT Q BURNER SHUTDOWN
P PREPURGE Q PREPURGE IN PROGRESS
1 IGNITION Q BURNER IGNITION TRIAL IN PROGRESS
2 BURNER ON Q BURNER ON
g LIFE EXPIRED Q POST-LOCKOUT MAINTENANCE ALERT
Y POSTCOMBUSTION Q WAITING FOR FLAME QUENCHING
W POSTPURGE Q POSTPURGE IN PROGRESS
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