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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="Copyright" content="Copyright (c) 2006 by IBM Corporation">
<title>5250 Data Stream Details</title>
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<h2>5250 Data Stream Details</h2>
<h3><a name="HDRAID">AID-Generating Keys</a></h3>
<p>The AID (attention indicator) code identifies to the host system the
function being requested from the keyboard. The AID code is returned by certain
input operations when the operator presses an AID-generating key. The following
table lists the AID-generating keys and the AID codes associated with each key.
See <a href="QsnCrtEnv.htm#HDRLLDESC">Format of the Low-Level Environment
Description</a> for instructions on how to specify an alternative help key.</p>
<table border>
<tr>
<th align="left" valign="top" colspan="3"><em>AID Codes</em></th>
</tr>
<tr>
<th align="left" valign="top">AID key</th>
<th align="left" valign="top">Mnemonic</th>
<th align="left" valign="top">AID Code</th>
</tr>
<tr>
<td align="left" valign="top">Cmd 1 - 12 (cmd 1=x'31', cmd12=x'3C')</td>
<td align="left" valign="top">QSN_F1 - QSN_F12</td>
<td align="left" valign="top">x'31' - x'3C'</td>
</tr>
<tr>
<td align="left" valign="top">Selector Light Pen Auto Enter</td>
<td align="left" valign="top">QSN_SLP</td>
<td align="left" valign="top">x'3F'</td>
</tr>
<tr>
<td align="left" valign="top">Forward Edge Trigger Auto Enter</td>
<td align="left" valign="top">QSN_FET</td>
<td align="left" valign="top">x'50'</td>
</tr>
<tr>
<td align="left" valign="top">PA1</td>
<td align="left" valign="top">QSN_PA1</td>
<td align="left" valign="top">x'6C'</td>
</tr>
<tr>
<td align="left" valign="top">PA2</td>
<td align="left" valign="top">QSN_PA2</td>
<td align="left" valign="top">x'6E'</td>
</tr>
<tr>
<td align="left" valign="top">PA3</td>
<td align="left" valign="top">QSN_PA3</td>
<td align="left" valign="top">x'6B'</td>
</tr>
<tr>
<td align="left" valign="top">Cmd 13 - 24 (cmd 13=x'B1', cmd24=x'BC')</td>
<td align="left" valign="top">QSN_F13 - QSN_F24</td>
<td align="left" valign="top">x'B1' - x'BC'</td>
</tr>
<tr>
<td align="left" valign="top">Clear</td>
<td align="left" valign="top">QSN_CLEAR</td>
<td align="left" valign="top">x'BD'</td>
</tr>
<tr>
<td align="left" valign="top">Enter or Record Advance</td>
<td align="left" valign="top">QSN_ENTER</td>
<td align="left" valign="top">x'F1'</td>
</tr>
<tr>
<td align="left" valign="top">Help (not in error state)</td>
<td align="left" valign="top">QSN_HELP</td>
<td align="left" valign="top">x'F3'</td>
</tr>
<tr>
<td align="left" valign="top">Roll Down or Page Up</td>
<td align="left" valign="top">QSN_ROLLDOWN or QSN_PAGEUP</td>
<td align="left" valign="top">x'F4'</td>
</tr>
<tr>
<td align="left" valign="top">Roll Up or Page Down</td>
<td align="left" valign="top">QSN_ROLLUP or QSN_PAGEDOWN</td>
<td align="left" valign="top">x'F5'</td>
</tr>
<tr>
<td align="left" valign="top">Print</td>
<td align="left" valign="top">QSN_PRINT</td>
<td align="left" valign="top">x'F6'</td>
</tr>
<tr>
<td align="left" valign="top">Record Backspace</td>
<td align="left" valign="top">QSN_RECBS</td>
<td align="left" valign="top">x'F8'</td>
</tr>
</table>
<br>
<br>
<h3><a name="HDRCC">Control Characters</a></h3>
<p>The display control characters (CCs) are always specified as a pair of
1-byte fields. They are used on the QsnWTD, QsnReadInp, QsnReadMDT, and
QsnReadMDTAlt APIs. These characters select specific operations for the display
station to perform. Byte 1 is always processed first. When the CCs are used
with the QsnWTD API, the first CC is processed immediately while the second CC
is not processed until all the other information associated with the API has
been processed. When used with an input operation, both CCs are processed after
the operation has completed. The following two tables list the valid control
character values and their associated mnemonics.</p>
<table border="1">
<!-- cols="24 10 10 15 15 13 13" -->
<tr>
<th align="left" valign="bottom" colspan="7"><em>Control Character Byte
1</em></th>
</tr>
<tr>
<th align="left" valign="bottom">Mnemonic</th>
<th align="left" valign="bottom">Bits 0-2</th>
<th align="left" valign="bottom">Reset Pending Aid; Lock Keyboard</th>
<th align="left" valign="bottom">Clear Master MDT; Reset MDT Flags in<br>
Nonbypass<br>
Fields</th>
<th align="left" valign="bottom">Clear Master MDT; Reset MDT Flags in All
Fields</th>
<th align="left" valign="bottom">Null Nonbypass Fields with MDT On</th>
<th align="left" valign="bottom">Null All Nonbypass Fields</th>
</tr>
<tr>
<td align="left" valign="top">QSN_CC1_ NULL</td>
<td align="left" valign="top">000</td>
<td align="center" valign="top">&nbsp;</td>
<td align="center" valign="top">&nbsp;</td>
<td align="center" valign="top">&nbsp;</td>
<td align="center" valign="top">&nbsp;</td>
<td align="center" valign="top">&nbsp;</td>
</tr>
<tr>
<td align="left" valign="top">QSN_CC1_ LOCKBD</td>
<td align="left" valign="top">001</td>
<td align="center" valign="top">x</td>
<td align="center" valign="top">&nbsp;</td>
<td align="center" valign="top">&nbsp;</td>
<td align="center" valign="top">&nbsp;</td>
<td align="center" valign="top">&nbsp;</td>
</tr>
<tr>
<td align="left" valign="top">QSN_CC1_ MDTNBY</td>
<td align="left" valign="top">010</td>
<td align="center" valign="top">x</td>
<td align="center" valign="top">x</td>
<td align="center" valign="top">&nbsp;</td>
<td align="center" valign="top">&nbsp;</td>
<td align="center" valign="top">&nbsp;</td>
</tr>
<tr>
<td align="left" valign="top">QSN_CC1_ MDTALL</td>
<td align="left" valign="top">011</td>
<td align="center" valign="top">x</td>
<td align="center" valign="top">&nbsp;</td>
<td align="center" valign="top">x</td>
<td align="center" valign="top">&nbsp;</td>
<td align="center" valign="top">&nbsp;</td>
</tr>
<tr>
<td align="left" valign="top">QSN_CC1_ CLRMOD</td>
<td align="left" valign="top">100</td>
<td align="center" valign="top">x</td>
<td align="center" valign="top">&nbsp;</td>
<td align="center" valign="top">&nbsp;</td>
<td align="center" valign="top">x</td>
<td align="center" valign="top">&nbsp;</td>
</tr>
<tr>
<td align="left" valign="top">QSN_CC1_MDTNBY_ CLRALL</td>
<td align="left" valign="top">101</td>
<td align="center" valign="top">x</td>
<td align="center" valign="top">x</td>
<td align="center" valign="top">&nbsp;</td>
<td align="center" valign="top">&nbsp;</td>
<td align="center" valign="top">x</td>
</tr>
<tr>
<td align="left" valign="top">QSN_CC1_MDTNBY_ CLRMOD</td>
<td align="left" valign="top">110</td>
<td align="center" valign="top">x</td>
<td align="center" valign="top">x</td>
<td align="center" valign="top">&nbsp;</td>
<td align="center" valign="top">x</td>
<td align="center" valign="top">&nbsp;</td>
</tr>
<tr>
<td align="left" valign="top">QSN_CC1_MDTALL_ CLRALL</td>
<td align="left" valign="top">111</td>
<td align="center" valign="top">x</td>
<td align="center" valign="top">&nbsp;</td>
<td align="center" valign="top">x</td>
<td align="center" valign="top">&nbsp;</td>
<td align="center" valign="top">x</td>
</tr>
<tr>
<td align="left" valign="top" colspan="7"><strong>Note:</strong>
<ol>
<li>Bits 3 through 7 are reserved and must be 0. A CPFA31C error will be issued
if this is not the case.<br>
<br>
</li>
<li>If there are no bypass fields with MDT flags on, then the master MDT will
be cleared.</li>
</ol>
</td>
</tr>
</table>
<br>
<br>
<table border="1">
<tr>
<th align="left" valign="top" colspan="3"><em>Control Character Byte
2</em></th>
</tr>
<tr>
<th align="left" valign="top">Mnemonic</th>
<th align="center" valign="top">Bit</th>
<th align="left" valign="top">Meaning</th>
</tr>
<tr>
<td align="left" valign="top" width="30%">&nbsp;</td>
<td align="center" valign="top" width="10%">0</td>
<td align="left" valign="top" width="60%">reserved</td>
</tr>
<tr>
<td align="left" valign="top">QSN_CC2_NO_IC</td>
<td align="center" valign="top">1</td>
<td align="left" valign="top">
<blockquote>
<p>0: Cursor moves to default or IC order position when keyboard unlocks</p>
<p>1: Cursor does not move when keyboard unlocks</p>
</blockquote>
</td>
</tr>
<tr>
<td align="left" valign="top">QSN_CC2_RST_CSR_BL</td>
<td align="center" valign="top">2</td>
<td align="left" valign="top">
<blockquote>
<p>0: no action</p>
<p>1: Reset blinking cursor</p>
</blockquote>
</td>
</tr>
<tr>
<td align="left" valign="top">QSN_CC2_SET_CSR_BL</td>
<td align="center" valign="top">3</td>
<td align="left" valign="top">
<blockquote>
<p>0: no action</p>
<p>1: Set blinking cursor</p>
</blockquote>
</td>
</tr>
<tr>
<td align="left" valign="top">QSN_CC2_UNLOCKBD</td>
<td align="center" valign="top">4</td>
<td align="left" valign="top">
<blockquote>
<p>0: no action</p>
<p>1: Unlock the keyboard and reset any pending AID bytes</p>
</blockquote>
</td>
</tr>
<tr>
<td align="left" valign="top">QSN_CC2_ALARM</td>
<td align="center" valign="top">5</td>
<td align="left" valign="top">
<blockquote>
<p>0: no action</p>
<p>1: Sound alarm</p>
</blockquote>
</td>
</tr>
<tr>
<td align="left" valign="top" width="2%">QSN_CC2_MSG_OFF</td>
<td align="center" valign="top">6</td>
<td align="left" valign="top" width="98%">
<blockquote>
<p>0: no action</p>
<p>1: Set Message Waiting indicator off</p>
</blockquote>
</td>
</tr>
<tr>
<td align="left" valign="top">QSN_CC2_MSG_ON</td>
<td align="center" valign="top">7</td>
<td align="left" valign="top">
<blockquote>
<p>0: no action</p>
<p>1: Set Message Waiting indicator on</p>
</blockquote>
</td>
</tr>
<tr>
<td align="left" valign="top" colspan="3"><strong>Notes:</strong>
<ul>
<li>The mnemonics for control character byte 2 can be combined with a bitwise
OR operation.<br>
<br>
</li>
<li>See notes in the 5250 data stream documentation for further details
regarding these functions.</li>
</ul>
</td>
</tr>
</table>
<br>
<br>
<h3><a name="HDRSCRATTR">Screen Attribute Characters</a></h3>
<p>The screen or field attributes control the image produced on the display
station screen. Each attribute occupies one character position in the display
station regeneration buffer and is displayed as a blank. The effect produced by
an attribute begins at its location in the regeneration buffer and continues
until the next attribute appears. The attributes for non-color displays are
shown in the table below and for color displays in the <a href=
"#TBLATTRCOL">Screen Attributes for Color Displays</a> table. There are certain
operations that allow a value to be specified for a screen attribute that
indicates no screen attribute should be used. Where supported, the value is
X'00' and the mnemonic is QSN_NO_SA.</p>
<table border="1">
<tr>
<th align="left" valign="top" colspan="3"><a name="TBLATTRBW"><em>Screen
Attributes for Non-Color Displays</em></a></th>
</tr>
<tr>
<th align="left" valign="top">Mnemonic</th>
<th align="center" valign="top">Bits</th>
<th align="left" valign="top">Value</th>
</tr>
<tr>
<td align="left" valign="top" width="30%">QSN_SA_NORM</td>
<td align="center" valign="top" width="10%">0-2</td>
<td align="left" valign="top" width="60%">001: Attribute identification
flag</td>
</tr>
<tr>
<td align="left" valign="top">QSN_SA_CS</td>
<td align="center" valign="top">3</td>
<td align="left" valign="top">
<blockquote>
<p>0: Column separator off</p>
<p>1: Column separator on</p>
</blockquote>
</td>
</tr>
<tr>
<td align="left" valign="top">QSN_SA_BL</td>
<td align="center" valign="top">4</td>
<td align="left" valign="top">
<blockquote>
<p>0: Do not blink field</p>
<p>1: Blink field</p>
</blockquote>
</td>
</tr>
<tr>
<td align="left" valign="top">QSN_SA_UL</td>
<td align="center" valign="top">5</td>
<td align="left" valign="top">
<blockquote>
<p>0: Do not underscore field</p>
<p>1: Underscore field</p>
</blockquote>
</td>
</tr>
<tr>
<td align="left" valign="top">QSN_SA_HI</td>
<td align="center" valign="top">6</td>
<td align="left" valign="top">
<blockquote>
<p>0: Low intensity</p>
<p>1: High intensity</p>
</blockquote>
</td>
</tr>
<tr>
<td align="left" valign="top">QSN_SA_RI</td>
<td align="center" valign="top">7</td>
<td align="left" valign="top">
<blockquote>
<p>0: Normal image</p>
<p>1: Reverse image</p>
</blockquote>
</td>
</tr>
<tr>
<td align="left" valign="top">QSN_SA_ND</td>
<td align="center" valign="top">&nbsp;</td>
<td align="left" valign="top">Non-display: equivalent to specifying QSN_SA_UL,
QSN_SA_HI, and QSN_SA_RI.</td>
</tr>
<tr>
<td align="left" valign="top" colspan="3"><strong>Note:</strong> Multiple
functions can be selected by combining the mnemonics with a bitwise OR
operation.</td>
</tr>
</table>
<br>
<br>
<table border="1">
<tr>
<th align="left" valign="top" colspan="3"><em><a name="TBLATTRCOL">Screen
Attributes for Color Displays</a></em></th>
</tr>
<tr>
<th align="left" valign="top">Mnemonic</th>
<th align="center" valign="top">Value</th>
<th align="left" valign="top">Meaning</th>
</tr>
<tr>
<td align="left" valign="top" width="30%">QSN_SA_GRN</td>
<td align="center" valign="top" width="20%">x'20'</td>
<td align="left" valign="top" width="50%">Green</td>
</tr>
<tr>
<td align="left" valign="top">QSN_SA_GRN_RI</td>
<td align="center" valign="top">x'21'</td>
<td align="left" valign="top">Green/Reverse Image</td>
</tr>
<tr>
<td align="left" valign="top">QSN_SA_WHT</td>
<td align="center" valign="top">x'22'</td>
<td align="left" valign="top">White</td>
</tr>
<tr>
<td align="left" valign="top">QSN_SA_WHT_RI</td>
<td align="center" valign="top">x'23'</td>
<td align="left" valign="top">White/Reverse Image</td>
</tr>
<tr>
<td align="left" valign="top">QSN_SA_GRN_UL</td>
<td align="center" valign="top">x'24'</td>
<td align="left" valign="top">Green/Underscore</td>
</tr>
<tr>
<td align="left" valign="top">QSN_SA_GRN_UL_RI</td>
<td align="center" valign="top">x'25'</td>
<td align="left" valign="top">Green/Underscore/Reverse Image</td>
</tr>
<tr>
<td align="left" valign="top">QSN_SA_WHT_UL</td>
<td align="center" valign="top">x'26'</td>
<td align="left" valign="top">White/Underscore</td>
</tr>
<tr>
<td align="left" valign="top">QSN_SA_ND</td>
<td align="center" valign="top">x'27'</td>
<td align="left" valign="top">Nondisplay</td>
</tr>
<tr>
<td align="left" valign="top">QSN_SA_RED</td>
<td align="center" valign="top">x'28'</td>
<td align="left" valign="top">Red</td>
</tr>
<tr>
<td align="left" valign="top">QSN_SA_RED_RI</td>
<td align="center" valign="top">x'29'</td>
<td align="left" valign="top">Red/Reverse Image</td>
</tr>
<tr>
<td align="left" valign="top">QSN_SA_RED_BL</td>
<td align="center" valign="top">x'2A'</td>
<td align="left" valign="top">Red/Blink</td>
</tr>
<tr>
<td align="left" valign="top">QSN_SA_RED_RI_BL</td>
<td align="center" valign="top">x'2B'</td>
<td align="left" valign="top">Red/Reverse Image/Blink</td>
</tr>
<tr>
<td align="left" valign="top">QSN_SA_RED_UL</td>
<td align="center" valign="top">x'2C'</td>
<td align="left" valign="top">Red/Underscore</td>
</tr>
<tr>
<td align="left" valign="top">QSN_SA_RED_UL_RI</td>
<td align="center" valign="top">x'2D'</td>
<td align="left" valign="top">Red/Underscore/Reverse Image</td>
</tr>
<tr>
<td align="left" valign="top">QSN_SA_RED_UL_BL</td>
<td align="center" valign="top">x'2E'</td>
<td align="left" valign="top">Red/Underscore/Blink</td>
</tr>
<tr>
<td align="left" valign="top">QSN_SA_ND_2F</td>
<td align="center" valign="top">x'2F'</td>
<td align="left" valign="top">Nondisplay</td>
</tr>
<tr>
<td align="left" valign="top">QSN_SA_TRQ_CS</td>
<td align="center" valign="top">x'30'</td>
<td align="left" valign="top">Turquoise/Column Separators</td>
</tr>
<tr>
<td align="left" valign="top">QSN_SA_TRQ_CS_RI</td>
<td align="center" valign="top">x'31'</td>
<td align="left" valign="top">Turquoise/Column Separators/Reverse Image</td>
</tr>
<tr>
<td align="left" valign="top">QSN_SA_YLW_CS</td>
<td align="center" valign="top">x'32'</td>
<td align="left" valign="top">Yellow/Column Separators</td>
</tr>
<tr>
<td align="left" valign="top">QSN_SA_YLW_CS_RI</td>
<td align="center" valign="top">x'33'</td>
<td align="left" valign="top">Yellow/Column Separators/Reverse Image</td>
</tr>
<tr>
<td align="left" valign="top">QSN_SA_TRQ_UL</td>
<td align="center" valign="top">x'34'</td>
<td align="left" valign="top">Turquoise/Underscore</td>
</tr>
<tr>
<td align="left" valign="top">QSN_SA_TRQ_UL_RI</td>
<td align="center" valign="top">x'35'</td>
<td align="left" valign="top">Turquoise/Underscore/Reverse Image</td>
</tr>
<tr>
<td align="left" valign="top">QSN_SA_YLW_UL</td>
<td align="center" valign="top">x'36'</td>
<td align="left" valign="top">Yellow/Underscore</td>
</tr>
<tr>
<td align="left" valign="top">QSN_SA_ND_37</td>
<td align="center" valign="top">x'37'</td>
<td align="left" valign="top">Nondisplay</td>
</tr>
<tr>
<td align="left" valign="top">QSN_SA_PNK</td>
<td align="center" valign="top">x'38'</td>
<td align="left" valign="top">Pink</td>
</tr>
<tr>
<td align="left" valign="top">QSN_SA_PNK_RI</td>
<td align="center" valign="top">x'39'</td>
<td align="left" valign="top">Pink/Reverse Image</td>
</tr>
<tr>
<td align="left" valign="top">QSN_SA_BLU</td>
<td align="center" valign="top">x'3A'</td>
<td align="left" valign="top">Blue</td>
</tr>
<tr>
<td align="left" valign="top">QSN_SA_BLU_RI</td>
<td align="center" valign="top">x'3B'</td>
<td align="left" valign="top">Blue/Reverse Image</td>
</tr>
<tr>
<td align="left" valign="top">QSN_SA_PNK_UL</td>
<td align="center" valign="top">x'3C'</td>
<td align="left" valign="top">Pink/Underscore</td>
</tr>
<tr>
<td align="left" valign="top">QSN_SA_PNK_UL_RI</td>
<td align="center" valign="top">x'3D'</td>
<td align="left" valign="top">Pink/Underscore/Reverse Image</td>
</tr>
<tr>
<td align="left" valign="top">QSN_SA_BLU_UL</td>
<td align="center" valign="top">x'3E'</td>
<td align="left" valign="top">Blue/Underscore</td>
</tr>
<tr>
<td align="left" valign="top">QSN_SA_ND_3F</td>
<td align="center" valign="top">x'3F'</td>
<td align="left" valign="top">Nondisplay</td>
</tr>
</table>
<br>
<br>
<h3><a name="HDRDSPADDR">Display Address</a></h3>
<p>The display address is the address at which data is displayed or a field
definition begins. This can be modified explicitly with a Set Output Address
(QsnSetOutAdr) call, or implicitly with output operations, such as those
associated with the Write Data (QsnWrtDta) API, that accept a cursor position.
The 5250 Write to Display (WTD) command initializes the display address to row
1, column 1. Because each output operation contains a WTD command, this means
that the display address is reset on each direct screen output operation.</p>
<br>
<h3><a name="HDRICADDR">Insert Cursor Address</a></h3>
<p>The insert cursor (IC) order specifies the position of the cursor when the
host system unlocks the keyboard and when the display station operator presses
the Home key. The display address is not affected by this address. This can be
set with the Insert Cursor (QsnInsCsr) API, and in some cases with the Set
Cursor Address (QsnSetCsrAdr) API (only when the Move Cursor (MC) order is not
supported).</p>
<br>
<h3><a name="HDRMDT">Modified Data Tag (MDT) Bit</a></h3>
<p>There is a modified data tag (MDT) bit for each input field and a master MDT
bit. These bits are used to determine which fields should be returned in
response to the Read Modified Fields (QsnReadMDT), Read Modified Alternate
(QsnReadMDTAlt), and Read Modified Immediate Alternate (QsnReadMDTImmAlt) APIs.
The MDT bit for a field and the master MDT bit can be set using bit 4 of the
field format word (see <a href="QsnSetFld.htm#HDRFFW">Format of the Field
Format Word</a>) on a Set Field (QsnSetFld) API. The master MDT bit and the MDT
bit for a field are set on anytime the operator types into or alters a field on
the display. Once the bits are set, only a control character for resetting them
(see <a href="#TBLCC1">Table 2</a>), or a clear screen operation using the
Clear Screen (QsnClrScr) API or a Start of Header order, can reset them.</p>
<br>
<h3><a name="HDRRESEQ">Resequencing</a></h3>
<p>Resequencing allows the control unit to return up to 128 input fields in any
specified order. Resequencing is accomplished by chaining input fields together
with Field Control Words specifying resequencing. (See <a href=
"QsnSetFld.htm#HDRFCW">Format of the Field Control Word</a> and the 5250 data
stream documentation for details.)</p>
<br>
<h3><a name="HDRSTATMOD">States and Modes</a></h3>
<p>The display station can be in one of several states (conditions), each with
its accompanying modes (methods of operation). The following is a list of these
states and their associated modes:</p>
<ul>
<li>Hardware error state</li>
<li>Normal locked state</li>
<li>Normal unlocked state
<ul>
<li>Command mode</li>
<li>Insert mode</li>
<li>Data mode</li>
</ul>
</li>
<li>Power-on state</li>
<li>Prehelp error state</li>
<li>Post-help error state</li>
<li>System services (SS) message state</li>
<li>System request state</li>
</ul>
<p>See the 5250 data stream documentation for a detailed explanation of each
state and mode.</p>
<br>
<h3><a name="HDRDUMP">Dumping the 5250 Data Stream Commands</a></h3>
<p>If you wish to produce a dump of the 5250 data stream commands that are
produced by the DSM APIs, you should create a physical file (using the CRTPF
command) having a record length of 2000. Name the physical file QSNDEBUGF, and
ensure that the QSNDEBUGF file exists in the library list. DSM will dump the
5250 data stream commands to that file.</p>
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