STANDARD SERIAL COMMUNICATION INTERFACE and ...

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Standard Serial Interface Protocol Description 4. ETX = End of Transmission Command byte (03 Hex). Indicates end of application layer message packet (used for text-based messages). 5. = Indicates the number of image writes the display module is to generate before stopping. If the user provides a (Hex) into this respective location, the display module will assume the message cycling is to resume indefinitely, overriding the "sleepmode" feature of the display module (Not recommended for long term battery operation). 6. = Off (non-inverted), and On (inverted) 7. = Off, for On. 8. ON Update Method – Byte to indicate how the controller is to present the respective partial image or message. The following codes apply: = “Wipe-ON” image presentation method (not valid for graphic messages). Characters within the image will appear to “grow” to the right as the text message is presented. Unlike the “Scroll-ON” method, characters to the left already presented in a previous frame will be stationary while new characters within the image are presented to the right. = “Scroll-ON” image presentation method (not valid for graphic messages). Characters within the image will appear to move to the left as the text message is presented. Unlike the “Wipe” update method, all the characters within the image will move until the final frame of the image is presented. = “Close-ON” image presentation method. This presentation method provides the illusion that the partial screen image is “sliding” down from the top and “sliding up from the bottom, until the final frame provides the completed image joined together. = “Open-ON” image presentation method. This presentation method provides the illusion that the partial screen image is “sliding” up and down from the center, until the final frame provides the completed image which has been completely “opened” from the center. = “Rotate-ON” image presentation method. This presentation method provides the illusion that the partial screen image is vertically rotating from the “Up-right” position, till it 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 section. 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. 9. 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 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 messages). This removal method is the same ast the “Scroll-ON” presentation method, with the characters being Standard Serial Communication Interface Description, © 1998-2002 Kent Displays Inc., doc. # 25016 Revision T, Page 41 of 52
Standard Serial Interface Protocol Description 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. 10. - This single byte of data is bit-mapped to indicate the following features: • Bit 7 through 3 – Reserved for future use. • Bit 0 – Bit 2 - Implement a 1x to 8x Image height feature. For instance, a 10 row partial image would be output on 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. If more than a 1x is selected for the full screen text image (“0” or “1” command), the same number of characters/line indicated in section 5.7.1 is maintained, however the number of text lines / image is 1/x (for instance, if the 2x mode is selected, the number of text lines /image is ½ the 1x values specified below in the next section. 5.7.1 Special “0”, “1”, “4”, “6” and “8” 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 40 characters/text line and up to 16 (if “1x”, 8 if “2x” selected) text lines/display image can be output using these font controls. a) (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 with a full-screen text command. 10x15 Pixel Characters: The font control below will occupy a 10x15 (columns x rows) pixel space/character. Up to 64 characters/text line and up to 32 (if “1x”, 16 if “2x” selected) text lines/display image can be output using this font control. b) (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 the full screen text command. Standard Serial Communication Interface Description, © 1998-2002 Kent Displays Inc., doc. # 25016 Revision T, Page 42 of 52
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