Assessments - 3, GPA: 3.7
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When you first plug in your AdderLink you will probably notice that the picture appears blurred or distorted or does not appear at all. The picture quality is maximised by adjusting the video compensation setting. To do this use the following procedure. STEP 1 Enter video compensation mode by pressing the HOTKEYS together with f ffon the keyboard connected to the XR receiver unit. The HOTKEYS are those that were set using the option switches (CTRL + ALT by default). For example, assuming the default hotkeys, press these keys together : b a f b a fb a f STEP 2 The AdderLink will now be in compensation adjustment mode. This is indicated by the NUM, CAPS and SCROLL lock lights on your keyboard. These will flash in sequence at a rate that indicates the level of compensation: a slow rate of flash indicates a compensation setting suitable for short lengths of twisted pair cable and a fast rate of flash indicates a compensation setting that is suitable for long lengths of twisted pair cable. Press g ggto select no video compensation. AdderLink Installation and Use Page 24 You should now see a ‘fuzzy’ video picture on your monitor connected to the XR receiver unit. STEP 3 You may now use the following keys to select the required video compensation. g gg Selects no video compensation. { {{Increases the video compensation (coarse adjustment). w ww Increases the video compensation (fine adjustment). } }}Decreases the video compensation (coarse adjustment). y yy Decreases the video compensation (fine adjustment). Various other keys may also be used to select operating options (see section 2.10) As you change the video compensation setting you will see the sharpness of the picture change. The AdderLink calculates the required brightness automatically. You will need more video compensation for longer twisted pair cable distances. Adjust the video compensation until you achieve the best picture. If you add too much compensation then the picture may be lost. If this happens reduce the compensation to restore the picture. AdderLink Installation and Use Page 25 The best compensation setting may be set using the following technique. • Press { {{until you observe white trailing edges on the right hand side of black text or graphics. • Press and release y yyseveral times until the white trailing edges just disappear. STEP 4 Press f ffto exit from compensation mode. The AdderLink saves the selected video compensation setting when you exit from compensation mode. This setting is retained within the AdderLink even when the power is off and so unless you change the twisted pair cable you will not need to readjust the compensation setting again. 2.9 Configuring user-selectable options The AdderLink supports a number of user-configurable options that change the detailed operation of the AdderLink to match the required application. These may be selected whilst the AdderLink is in video compensation / configuration mode. Whilst within configuration mode the version number of the AdderLink’s firmware may also be queried. To enter configuration mode press the HOTKEYS together with f ffon the keyboard connected to the XR receiver unit. The HOTKEYS are those that were set using the option switches (CTRL + ALT by default). For example, assuming the default hotkeys, press these keys together : b a f b a fb a f AdderLink Installation and Use Page 26 Options are then set by pressing a letter key followed by a number key followed by the RETURN key. For example to select an RS232 baud rate of 1200 use the following: Whilst within configuration mode press B BB1 11f ff The num, caps and scroll lock lights will indicate correct acceptance of the command as follows: • In compensation / configuration the num, caps and scroll lock lights will flash in sequence. • After pressing the first key of a command sequence the num, caps and scroll lock lights will all be illuminated. • After pressing the second key of a command sequence the num and caps lock lights will be on and the scroll lock light will be off. • After pressing RETURN the command will have been accepted and the num, caps and scroll lock lights will go back to flashing in sequence. When you have finished selecting options, return to normal operation by pressing f ff 2.10 Summary of AdderLink configuration options Full details of each of the configuration options and their uses are given in section 4. B1 B1B1f ff - Set RS232 baud rate to 1200 (default) (see section 4.1) B2 B2B2f ff - Set RS232 baud rate to 9600 F1 F1F1f ff - Query AdderLink firmware version (see section 3.11) F8 F8F8f ff - Resets all user-configurable options to the default state (see 4.3) AdderLink Installation and Use Page 27 H1 H1H1f ff - Mouse compatible RS232 protocol (default) – overrides all other RS232 settings (see section 4.1) H2 H2H2f ff - RS232 protocol uses hardware handshaking H3 H3H3f ff - RS232 protocol uses no handshaking (1200 baud max.) M1 M1M1f ff - AdderLink Gold channels are not switchable by a 3-button m...
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