DA1—Primary Device Attributes
In this DA exchange, the host asks for the terminal's architectural class and basic attributes.
Host Request
The host uses the following sequence to send this request:
| CSI 9/11 |
c 6/3 |
or | CSI 9/11 |
0 3/0 |
c 6/3 |
Terminal Response
The terminal responds by sending its architectural class and basic attributes to the host. This response depends on the terminal's current operating VT level.
| Response from North American Terminal | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| CSI 9/11 |
? 3/15 |
6 3/6 |
4 3/4 |
; 3/11 |
Ps1 3/n |
; 3/11 |
... ... |
Psn 3/n |
c 6/3 |
| Response from International Terminal | |||||||||
| CSI 9/11 |
? 3/15 |
6 3/6 |
4 3/4 |
; 3/11 |
Ps1 3/n |
; 3/11 |
... ... |
Psn 3/n |
c 6/3 |
Parameters
Ps1 ; . . . Psn
reports different device attributes between the North American terminal and the
international terminal.
The value of the first parameter is encoded so a simple range check can be performed to determine the basic service class and level of the device. The VT510 is a level 4 terminal so its service class code is 64. The following extensions to level 4 are provided:
| Ps | Meaning |
|---|---|
| 1 | 132 columns |
| 2 | Printer port |
| 4 | Sixel |
| 6 | Selective erase |
| 7 | Soft character set (DRCS) |
| 8 | User-defined keys (UDKs) |
| 9 | National replacement character sets (NRCS) (International terminal only) |
| 12 | Yugoslavian (SCS) |
| 15 | Technical character set |
| 18 | Windowing capability |
| 21 | Horizontal scrolling |
| 23 | Greek |
| 24 | Turkish |
| 42 | ISO Latin-2 character set |
| 44 | PCTerm |
| 45 | Soft key map |
| 46 | ASCII emulation |
Primary DA Example
Here is a typical primary DA exchange.
| Exchange | Sequence | Meaning |
|---|---|---|
| Request (Host to VT510) |
CSI c or CSI 0 c | The host asks for the terminal's architectural class code and supported extensions. |
| Response—N.A. (VT510 to host) | CSI ? 64; 1; 2; 7; 8; 9; 15; 18; 21; 44; 45; 46 c | The terminal is a class 4 device (64) and supports the Ps parameters listed above. |
| Response— International (VT510 to host) | CSI ? 64; 1; 2; 7; 8; 9; 12; 15; 18; 21; 23; 24; 42; 44; 45; 46 c | The terminal is a class 4 device (64) and supports the Ps parameters listed above. |