Black Box PCW22A-R3 Cable Box User Manual


 
PROTOCOL CONVERTER A/S-2G
18
Data Flow — A/S-2G to Synchronous Device
Bisynchronous Device A/S-2G Converter Asynchronous Device
*Assumes block size of 80 is selected.
IF 2270 - 2780
AA AA 32 32 32 32 02
(text up to 80 characters),
IF, BCC1, BCC2; etc. (last
record 26, BCC1, BCC2, FF
FF
IF 3780
AA AA 32 32 32 32 02
(text up to 80* characters
with records separated by
1E, last record in block 1E,
26, BCC1, BCC2, FF FF
IF 3741
AA AA 32 32 32 32 02
(up to 128 characters), 26,
BCC1, BCC2, FF FF
ACK 1
Positive Acknowledgment—
Odd AA AA 32 32 32 32 10
61 FF FF
ACK 0
(Echo CR LF)
Block B of data
(Echo all but CR LF)
(Echo CR LF)
Block C of data
(Echo all but CR LF)
Block of D of data begins
Send block B