Teledyne 440, System Manual, Page: 134 / 256

6 – Operating Procedure
6-30 © Teledyne TSS DPN 402196 Issue 4.1
NOTE
❐ The timestamp is always formatted as HH:MM:SS:SSS. Additional, zeros will
be used to ensure field length remains fixed.
❐ See section 6.4.1.1 "External Logging Format" on page 6-23 for the coordi-
nates packet description.
❐ Checksum is calculated by XORing all characters before the asterisk,
excluding the ‘$’ start character. The resultant hexadecimal value is ASCII-
encoded and appended to the packet before the CR/LF packet termination
characters.
6.4.1.2 Internal Logging Format
The format used for internal logging is identical to that used by the SEP to transmit data packets.
These data packets fall into two categories – ‘Co-ordinates’ and ‘Signals’. The SEP transmits them
alternately.
A) ‘Co-ordinates’ Data Packet
The string is 24 characters long with individual fields definitions as follows. The SDC logs all distances
in units of centimetres. The values in the packet are rounded and it is possible that they will not
precisely match those on the Run Display screen.
Table 6-6: Internal Co-ordinates format
Start
character
Carriage
return
Line
-
feed
characters
Checksum
(see
Note
3)
Coordinates
packet
(see
Note
2)
Space
T
imestamp
(see
Note
1)
$HH:MM:SS:SSS I±LLL VVV AAA [CRLF] ±CCC*CC