2019r0
Page 32 of 82
Mercury 2+ Operator Terminal User Manual
The effect of each standard ASCII control character is given in
Table 4.
Each character can act as a standalone control code as above, or
can be combined in strings to create escape sequences that offer
further control and data transmission opportunities.
To combine characters into strings, the <ESC> control code must
begin all sequences. The <ESC> (1B
H
) code indicates to the unit
receiving data that the following string should be considered
together.
Escape Sequence
Table 4
Control Character
Actions
Character String
<NUL> <SOH> <EOT>
<ENQ> <ACK> <HT> <SO>
<SI> <DLE> <DC2> <DC4>
<NAK> <SYN> <ETB> <EM>
<SUB> <FS> <GS> <RS>
<US>
<STX> <ETX>
<BEL>
<BS>
<LF> <VT> <FF>
<CR>
<DC1>
<DC3>
<CAN>
<ESC>
<EM>
<IND>
<DEL> (7F
H
)
Action
These characters terminate
escape sequences and are not
displayed
Codes to start and stop blocks.
Sounds Beeper.
Back Space.
Line feed.
Carriage Return.
Xon. Causes Terminal to
continue transmitting.
Xoff. Causes Terminal to stop
transmitting.
Cancels Escape Sequence.
Introduces Escape Sequence.
Special Terminator for
messages
Processed as "down arrow"
key.
Terminates any escape
sequence which is in progress.
