User manual EPSON APEX 80

[. . . ] FCC COMPLIANCE STATEMENT FOR AMERICAN USERS This equipment generates and uses radio frequency energy and if not installed and used prop erly, that is, in strict accordance with the manufacturer's instructions, may cause interference to radio and television reception. It has been type tested and found to comply with the limits for a Class B computing device in accordance with the specifications in Subpart J of part 15 of FCC Rules, which are designed to provide reasonable protection against such interference in a residential installation. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause interference to radio or television recep tion, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: - Reorient the receiving antenna - Relocate the printer with respect to the receiver - Plug the printer into a different outlet so that the printer and receiver are on different branch circuits. [. . . ] The Apex80 also forms its images with patterns of dots, as many as 240 dot positions per inch horizontally and 72 dots vertically. The images printed by the Apex80 can, therefore, be as finely detailed as the one on the first page of this chapter. In its main graphics mode the Apex80 prints one column of dots for each code it receives, and it uses only the top eight of the nine pins. Therefore, your graphics program must send codes for dot patterns, one number for each column in a line. For each of those columns the print head prints the pattern of dots you have specified. To print figures taller than eight dots, the print head makes more than one pass. The printer prints one line, then advances the paper and prints another, just as it does with text. To keep the print head from leaving gaps between the graphics lines as it does between the text lines, the line spacing must be changed to eliminate the space between lines. With a change in line spacing, the Apex80 can print finely detailed graphic images that give no indication that they are made up of separate lines, each no more than 8/72nds of an inch tall. Each pass of the print head prints one piece of the total pattern, which can be as tall or short and as wide or narrow as you desire. You don't have to fill the whole page or even an entire line with your graphics figures. In fact, you can use as little or as much space as you like for a figure and put it anywhere on the page. Pin Labels The graphics mode requires a method to tell the printer which pins to fire in each column. Since there are 256 possible combinations of eight pins, you need a numbering system that allows you to use a single number to specify which of the 256 possible patterns you want. This numbering system is shown in Figure 6-1 on the next page. Introduction to Dot Graphics 6. 3 To fire any one pin, you send its number. To fire more than one pin at the same time, add up the numbers of the pins and send the sum to the printer. Therefore, with these labels for the pins, you fire the top pin by sending 128. If you want to fire only the top and bottom pins, you simply add 128 and 1, then send 129. By adding the appropriate label numbers together, you can fire any combination of pins. Figure 6-1 shows three examples of how to calculate the number that fires a particular pattern of pins. Figure 6-1 Pin numbering system With this numbering system, any combination of the eight pins adds up to a decimal number between 0 and 255, and no numbers are duplicated. Before you can put these numbers in a graphics program, however, you need to know the format of the graphics commands. Graphics Commands The graphics mode commands are quite different from most other commands. For most of the other modes, such as emphasized and double-wide, one command turns the mode on and another turns it off. For graphics, the command is more complicated because the command that turns on a graphics mode also specifies how many columns of graphics will be printed. [. . . ] 2-1/interface) HIGH HIGH HIGH/LOW (no effect) DC1/DC3 (Data on/off contr. ) DC1 /DC3 (no effect) DC1 RECV'D DC3 RECV'D DC1/DC3 (no effect) ERROR HIGH HIGH HIGH LOW BUSY HIGH/LOW HIGH/LOW HIGH/LOW HIGH ACKNLG (Disabled/enabled) Printing ENABLED PULSED EA. *DISABLED NOT GENERATED DISABLED *Even though printing is disabled, data characters are received and acknowledged, since the printer is looking for another DC1 character, which would allow it to resume printing. Index Command descriptions are not indexed here. For page references for specific commands, see pages A-4--6 or the Quick Reference card. A American Standard Code for Information Interchange, 2-2 ASCII, 2-2 AUTO LOAD, 1-17--19, 1-21 Automatic paper loading, 1-17--19 Connecting printer to computer, 1-23--24 Continuous-feed paper, 1-2, 1-7--15 Control codes, 2-2. See also Commands Control keys, A-3 Control panel, 1-19--22 B BASIC, 2-6--7 Baud rate. [. . . ]