Appendix A: Interfaces
MTD200 MPEG Test Decoder User Manual
A–7
To control the interface, some control characters are taken from the ASCII code
range from 0 to 20 hexadecimal. The control characters are transmitted via the
interface.
Table A–8: Control characters of the RS-232 interface
Name
Control character
Function
SRQ_char
<Ctrl B> 02 hexadecimal
Service request function (SRQ)
If bit 6 of status byte is set, this character will be sent.
The receipt of the character SRQ_char is ignored.
XON_char
<Ctrl Q> 11 hexadecimal
Enable character output
The XON_char character informs the remote station
that it may again transmit data.
XOFF_char <Ctrl S> 13 hexadecimal
Stop character output
The XOFF_char character informs the remote station
not to send further data.
END_char
0D hexadecimal,
0A hexadecimal
Delimiter <CR><LF>
Software handshake.
In case of a software handshake, data transmission is
controlled via the two control characters XON_char / XOFF_char. The MPEG
test decoder signals its ready-to-receive state via the control character XON_char.
If the receive buffer is full, the MPEG test decoder informs the controller by
means of control character XOFF_char not to send further data. The controller
thus interrupts the data output as long as it receives another XON_char from the
MPEG test decoder. The controller signals its ready-to-receive state to the MPEG
test decoder in the same way.
During the transmission of block data the software handshake is not possible
because of the above-mentioned reasons.
Interface Functions
Handshake
Summary of Contents for MTD200
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