Changes between Initial Version and Version 1 of RobitronicSerial

Timestamp:

02/23/10 16:41:55 (14 years ago)

Author:

pinwc4

Comment:

--

RobitronicSerial

@@ +1 @@
+= Robitronic Overview =
+The Robitronic lap counter is an IR based lap counter that communicates using a serial protocol.  
+
+= Connection Information =
+To connect to the Robitronic lap counter you must open the COM port with the following settings:
+ * 38400 Baud
+ * 1 Stop Bit
+ * Parity None
+ * Length 8 bits
+
+= Initialization =
+After you have connected to the Robitronic lap counter you must initialize it for communications.  This is done with a simple command.
+
+{{{ 03 B9 01 }}}
+
+After this has been sent the lap counter will respond with a 00 and then beginning transmitting lap information.  There are two know packet types that the lap counter will return, a packet when a car is detected and a periodic time packet.
+
+There appears to be no delimiter character, packets begin with a byte representing the length of the packet.
+
+= Car Detected Packet =
+
+If a car is detected the lap counter will return a packet like the following:
+
+{{{ 0D BD 84 1E 08 00 00 E7 36 00 00 55 F9 }}}
+
+The breakdown of this packet is the following:
+
+{{{ 
+Byte 1 is the length of the packet including this byte 0D for car detected packets
+Byte 2 is the checksum
+Byte 3 is the type of packet, 84 if this has car information
+Byte 4-5 represent the UID of the car in reverse byte order
+Byte 6-7 unknown, 00 in examples given
+Byte 8-9 are the seconds in thousandths of a second
+Byte 10 is the minutes
+Byet 11 may be continuation of minutes or hours was 00 in our example so this is uncertain
+Byte 12 is the number of hits the lap counter detected
+Byte 13 is the signal strength
+}}}
+
+There is no specific character used to represent the beginning or end of a packet, instead the protocol has the first byte of the packet set to the length of the packet including that byte.
+
+= Time stamp packet =
+
+Approximately every second the lap counter will send a packet with just the time stamp.  This pack can look like this:
+
+{{{ 0B 5C 83 9B 3A 00 00 14 D0 01 02 }}}
+
+The breakdown of this packet is the following:
+
+{{{
+Byte 1 is the length of the packet 0B in the case of just a time stamp
+Byte 2 is a checksum
+Byte 3 is the packet type, 83 in the case of time stamp only
+Byte 4-5 is the seconds in reverse byte order in thousandths of a second
+Byte 6 is the minutes
+Byte 7 is unknown, may be hours or continuation of minutes
+Bytes 8-11 are unknown but in example were always 14 D0 01 02
+}}}
+