User guide

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 SERIAL PORT:
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 –