Appendix K:
Using the RS-232 Port
(abridged)

HX-20/RS-232 Device Protocol
Protocol Format: BLPSC

B:	Baud Rate
0	110
1	150
2	300
3	600
4	1200
5	2400
6 (default)	4800

L:	Word Length
7	7-bit word
8 (default)	8-bit word

P:	Parity
N (default)	None
E	Even
O	Odd

S:	Stop Bits
1	1 stop bit
2 (default)	2 stop bits

C = Active Control Lines
Value	CTS	DSR	RTS	CD
0	normal	normal	low level	normal
1	normal	normal	low level	ignore
2	normal	normal	high level	normal
3	normal	normal	high level	ignore
4	normal	ignore	low level	normal
5	normal	ignore	low level	ignore
6	normal	ignore	high level	normal
7	normal	ignore	high level	ignore
8	ignore	normal	low level	normal
9	ignore	normal	low level	ignore
A	ignore	normal	high level	normal
B (default)	ignore	normal	high level	ignore
C	ignore	ignore	low level	normal
D	ignore	ignore	low level	ignore
E	ignore	ignore	high level	normal
F	ignore	ignore	high level	ignore

HX-20 Default Protocol
for RS-232 Port

Data Rate:	4800 Baud.
Word length:	8 bits.
Parity:	None.
Stop bits:	2.
CD (Carrier Detect):	Ignored.
RTS (Ready to Send):	Held "high" by HX-20. Controlled by external device. "High" means HX-20 may transmit data; "low" causes HX-20 to wait.
DSR (Data Set Ready):	Normal.
CTS (Clear to Send):	Ignored.

Return to HX-20 Page

Interface Cable Save Command Load Command Appendix K
ASCII Chart Memory Dump Memory Map Op-Code Table

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