Appendix B B-5
While awaiting a command, PowerWave responds to nulls or other
unintentional characters by clearing its input buffer and transmitting a
NAK. Therefore, if valid commands are preceded by invalid characters,
they may be missed.
ASCII
Code
Function Hex
Code
Decimal
Code
Control
Code
Reader
↔
ACK Acknowledge 06 06 ^F
→
NAK Negative
acknowledge
15 21 ^U
→
RS Record separator 1E 30 ^^
→
ETX End of text 03 03 ^C
↔
DLE Data link escape 10 16 ^P
→
CR Carriage return 0D 13 ^M
←
LF Line feed 0A 10 ^J
←
CTRL-Z Control Z 1A 26 ^Z
←
Table B-2: ASCII Control Characters Used in Computer Control Protocol
All commands can be executed from the serial port.
As the final part of executing all commands, PowerWave transmits a
status string to the computer. When the reader sends data to the
computer, the data is sent first, then the status string.
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