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Standard Serial Interface Protocol Description reaches an “Upside Down position”, then the frame sequence is reversed till the final frame of the “Up-right” position is reached. = "Swell-ON' image presentation method. This presentation method is used as an alternate method of generating a static frame of data. Unlike the previous methods where multiple frames are presented to the user, this method will only generate a single frame representative of the text or graphic data provided at the interface. This method will automatically use the “No OFF” OFF update method, outlined in the next bullet text. Unlike the "Fade-ON", this update method will erase the screen section prior (hence destroying the previous image) to generating the image in the cumulative drive method, hence creating an illusion that the new image will grow in brightness or "Swell" from a blank background during the update. = "Fade-ON" image presentation method. Like the "Swell-ON", this method is used as an alternate method of generating a static frame of data. This method will automatically use the “No OFF” OFF update method, outlined in the next bullet text. Unlike the "Swell- ON", this update method will NOT erase the screen section prior to generating the image in the cumulative drive method, hence creating an illustion that the new image section will start to appear as the previous image starts to disappear, hence the new image will appear to "Fade" over the previous. 7. OFF Update Method – Byte to indicate how the controller is to remove the respective partial image or message. The following codes apply: = “Wipe-OFF” image removal method (not valid for graphic “F” command messages). This removal method is the opposite of the “Wipe-ON” presentation method, with the characters being removed from right to left. The left-most character is the last character removed from the image area. = “Scroll-OFF” image removal method (not valid for graphic “F” command messages). This removal method is the same ast the “Scroll-ON” presentation method, with the characters being removed from right to left. The right-most character is the last character removed from the image area. = “Open-OFF” image removal method. This removal method is the opposite of the “Close-ON” presentation method, with the characters being removed from center towards the top and bottom edges of the image area. The middle-most rows of the image are the last portions removed from the image area. = “Close-OFF” image removal method. This removal method is the opposite of the “Open-ON” presentation method, with the characters being removed from the top and bottom edges towards the center of the image area. The top and bottom rows of the image are the last portions removed from the image area. = “No OFF” image presentation method. This number will inform the respective controller to NOT remove the respective partial image after the respective pause duration has expired. 8. - This single byte of data is bit-mapped to indicate the following features: o Bit 7 – Implements a “2x” horizontal image “Strech” feature if activated (set to 1). This feature is only valid for partial screen, Dynamic Update, single frame, text based “Fades” or “Swells”. For instance, if implemented on a fixed distance 9 point line of text, the characters on the display will be twice as wide, and the maximum number of characters per text line (normally 40 for this font. Refer to next sub-section for explanation on font selection & control) will be half as much, or 20. o Bit 6 through 3 – Reserved for future use. o Bit 0 – Bit 2 - Implement a “1x” to “8x” Image height or vertical “Stretch” feature. For instance, a 10 row partial image would be output on all 80 rows of the respective display if all 3 bits are set high. The same 10 row image can be output on 40 rows of the display if bits 0 and 1 are set high. Clearing all bits will output the image to the normal, 1x mode where the 10 row image will be output on 10 rows of the display. Standard Serial Communication Interface Description, © 1998-2002 Kent Displays Inc., doc. # 25016 Revision T, Page 35 of 52
Standard Serial Interface Protocol Description Note: Changing the contents of an image while writing the image to the screen could result in an undetermined image to be displayed. 5.6.1 Special “0”, “2”, “4” and “6” Command Text Control Characters As indicated in the referenced command descriptions, the resident sign firmware has the capability to output text messages requested by the host computer. The host does not need to inform the display module which pixel to turn on or off to create a text character image. The sign modules also have the capability to output selected fonts and respond to font control characters. When the following special control characters (described in hexadecimal format within the "") are added within field 6 of the respective application layer messages, the following actions will occur (the following control characters must be the 1 st data elements entered in field #6): 16x30 Pixel Characters: Each of the following described font controls will occupy a 16x30 (columns x rows) pixel space/character. Up to 20 characters/text line and up to 2 text lines/display image can be output using these font controls. a) (VT) = Turn ON Tahoma 16 Font Control Character. All characters entered in field 6 after the reception of this control character will be output with the modified Tahoma 16 point font format. A carriage return (0D in hexadecimal without a line feed) will need to be entered between the consecutive lines of text if used for a “0” command. b) (HT) = Turn ON Times 16 Font Control Character. All characters entered in field 6 after the reception of this control character will be output with the modified Times Roman 16 point font format. A carriage return (0D in hexadecimal without a line feed) will need to be entered between the consecutive lines of text if used for a “0” command. c) (DC1) = Turn ON Letter Gothic 22 Font Control character. All characters entered in field 6 after the reception of this control character will be output with the modified Letter Gothic 22 point font format. A carriage return (0D in hexadecimal without a line feed) will need to be entered between the consecutive lines of text if used for a “0” command. 10x15 Pixel Characters: The font control below will occupy a 10x15 (columns x rows) pixel space/character. Up to 32 characters/text line and up to 5 text lines/display image can be output using this font control. d) (DC2) = Turn ON Fixed Distance 11 point Font Control character. All characters entered in field 6 will be output in the Fixed distance 11 point font format. A carriage return (0D in hexadecimal without a line feed) will need to be entered between the consecutive lines of text if used for a “0” command. 6x8 Pixel Characters: The font control below will occupy a 6x8 (columns x rows) pixel space/character. Up to 53 characters/text line and up to 10 text lines/display image can be output using this font control. e) (ENQ) = Turn ON 5x7 character Font Control characters. All characters entered in field 6 will be output in this format after reception. A carriage return (0D in hexadecimal without a line feed) will need to be entered between the consecutive lines of text if used for a “0” command. Notes: The absence of the above control characters will command the respective display controller to output the respective display in Fixed Distance 9 point; the default display font. With the Standard Serial Communication Interface Description, © 1998-2002 Kent Displays Inc., doc. # 25016 Revision T, Page 36 of 52
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