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The Select Character Set command provides the mechanism for addressing the Extended
Character Set when the serial interface is set to operate with seven data bits.
When seven data bits are used, the Standard Character Set and the Extended Character Set are
both represented by the codes 0 through 127, decimal (0 though 7F, hex). The host shifts
(selects) between the two character sets by sending the Select Character Set command.
To address the Extended Character Set with a 7-bit code, the host:
1.
Sends the Shift Out code <SO> (14 decimal, E hex) to select the Extended Character Set.
2.
Sends the 7-bit graphic code corresponding to each desired character. The TCS converts each
7-bit code to an 8-bit code by adding a "l" as the most significant bit, selecting a character in
the Extended Character Set.
3.
Sends the Shift In character <SI> (15 decimal, F hex) to return to the Standard Character Set.
The TCS interprets any subsequent 7-bit graphic codes as selecting corresponding characters
within the Standard Character set.
Once the TCS has received <SO>, the TCS interprets subsequent graphic codes as selecting
Extended Characters until the TCS receives <SI>.
For compatibility, <SO> selects the Extended Character Set even when communicating with
eight data bits. That is, 8-bit graphic codes that fall within the Standard Character Set also select
corresponding characters from within the Extended Character Set.
NOTE
Control codes are not affected by this command.
Once the TCS has received <SO> from the host, additional <SO> codes are ignored until <SI> is
received. That is, it is permissible to send several <SO> codes without an intervening <SI>, or
several <SI> codes without an intervening <SO>. In either case, the host is merely reselecting the
character set already in use. When the Extended Character set is selected, the National
Replacement Code command has no effect.
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The Standard Character set is selected.
23(5$72586$*(
None. (This is a remote command only.)
Summary of Contents for Dynapro ET TCS
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