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DigiCart/II Plus Owner's Manual
Appendix B -
Serial Control Protocol
91
Data Format
The data format follows the ES-Bus specification in that the data transfer is
asynchronous, 8 bits per byte, even parity, 1 start and 1 stop bit, for a total of 11 bits.
In all cases, the message structure is fully compatible with ES-Bus. In general, all
messages will be acknowledged by an ACK if successful or NAK if an error occurred.
P
INOUT FOR THE
S
ERIAL
P
ORT
:
Pin 1
GND
Pin 2
+ 5 VOLTS (not normally used)
Pin 3
GND
Pin 4
TX +
Pin 5
TX –
Pin 6
HSK OUT (not normally used)
Pin 7
HSK IN (not normally used)
Pin 8
RX +
Pin 9
RX –
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