RS232 Serial Communications Control Characters


This is a complete list of the control codes used in serial transmissions.


ASCII Code Control Character Name Meaning
0 ^@ NULL Null
1 ^A SOH Start of Header
2 ^B STX Start of Text
3 ^C ETX End of Text
4 ^D EOT End of Transmission
5 ^E ENQ Enquiry
6 ^F ACK Acknowledge
7 ^G BEL Bell
8 ^H BS Backspace
9 ^I HT Horizontal Tab
10 ^J LF Line Feed
11 ^K VT Vertical Tab
12 ^L FF Form Feed
13 ^M CR Carriage Return
14 ^N SO Shift Out
15 ^O SI Shift In
16 ^P DLE Data Link Escape
17 ^Q DC1 Device Control 1
18 ^R DC2 Device Control 2
19 ^S DC3 Device Control 3
20 ^T DC4 Device Control 4
21 ^U NAK Negative Acknowledge
22 ^V SYN Synchronous Idle
23 ^W ETB End Transmission Block
24 ^X CAN Cancel
25 ^Y EM End of Medium
26 ^Z SUB Substitute
27 ^[ ESC Escape
28 ^\ FS File Separator
29 ^] GS Group Separator
30 ^^ RS Record Separator
31 ^_ US Unit Separator

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