🚀 go-pugleaf

Hi N.  :)
Serial communications uses the ASCII character set and they were 
probably designed hand-in-hand
the letter 'T' is at position 84 in the ASCII table and the letters 'A' 
to 'Z'  runs from 65 to 90. I hope you get this.

Now, there are what is called non printable characters or control 
characters that were / are used primarily for Serial Communications
These run from position 0 = NULL CHARACTER to 31.
When doing software flow control in Serial comms you will need to design 
your app to recognise and send these characters for flow control.
Here is the list - I hope this helps....

Dec     Hex  ASCII Description                      ^Key

0	0	NUL (null)	Ctrl-@
1	1	SOH (start of heading)	Ctrl-A
2	2	STX (start of text)	Ctrl-B
3	3	ETX (end of text)	Ctrl-C
4	4	EOT (end of transmission)	Ctrl-D
5	5	ENQ (enquiry)	Ctrl-E
6	6	ACK (acknowledge)	Ctrl-F
7	7	BEL (bell)	Ctrl-G
8	8	BS (backspace)	Ctrl-H
9	9	HT (horizontal tab)	Ctrl-I
10	A	LF (line feed)	Ctrl-J
11	B	VT (vertical tab)	Ctrl-K
12	C	FF (form feed)	Ctrl-L
13	D	CR (carriage return)	Ctrl-M
14	E	SO (shift out)	Ctrl-N
15	F	SI (shift in)	Ctrl-O
16	10	DLE (data link escape)	Ctrl-P
17	11	DC1 (device control 1) XON	Ctrl-Q
18	12	DC2 (device control 2)	Ctrl-R
19	13	DC3 (device control 3) XOFF	Ctrl-S
20	14	DC4 (device control 4)	Ctrl-T
21	15	NAK (negative acknowledge)	Ctrl-U
22	16	SYN (synchronous idle)	Ctrl-V
23	17	ETB (end of trans. block)	Ctrl-W
24	18	CAN (cancel)	Ctrl-X
25	19	EM (end of medium)	Ctrl-Y
26	1A	SUB (substitute)	Ctrl-Z
27	1B	ESC (escape)	Ctrl-[
28	1C	FS (file separator)	Ctrl-\
29	1D	GS (group separator)	Ctrl-]
30	1E	RS (record separator)	Ctrl-^
31	1F	US (unit separator)	Ctrl-_



N. Karademir wrote:
> Hello,
> 
> can someone give me some info about ack/enq protocol?
> 
> i f i am right, the rs232 device sends me ENQ, then i send ACK back, then it
> sends data, finally i'll sent ACK.?
> 
> How do i send ACK?
> 
> is this just the letters "ACK" ?
> or is it a dec / hex value i have to send?
> 
> 
> 
> thanks
> 
> 
> N. Karademir
> 
> 
> 
>