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Programming Model
The television demodulator uses the BCP Simplified Communication
Link protocol (SCL). With the SCL Protocol, you program a PC to
send and receive data using standard I/O functions found in most
programming languages, such as C, PASCAL, and BASIC.
The SCL protocol supports asynchronous binary communication, not
text or ASCII based. Communication is based on 8-bit bytes ranging
from 0 to 255. Table B–2 lists special byte codes used to coordinate
data transfers between the PC and the television demodulator. For
information on how to use these special byte codes, refer to Sending
and Receiving Data on page B–5.
Table B–2: Special byte codes
Code mne-
monic
STX
ETX
ENQ
DLE
ACKO
WACK
Ad
Ar
Ars
Arr
*
You assign the remote address. For more information, refer to
Addresses on page B–3.
Addresses
The television demodulator has four addresses that are necessary for
communication using the SCL protocol. Table B–2 lists the four
addresses: Ad, Ar, Ars, and Arr. For information on using these
DS1000 Series User Manual
ASCII
Description
02 hex
Start of data
03 hex
End of data
05 hex
Enquiry
10 hex
Data link escape
11 hex
Device is ready
3B hex
Device is not ready
0F hex
Device address
*
User-defined remote address
Ar x 2
Send remote address
Ar x 2 + 1
Receive remote address
Appendix B: Remote Control
Control
characters
^B
^C
^E
^P
^Q
;
^O
B–3
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