User manual TEKTRONIX YT-1

[. . . ] Instruction Manual YT-1 / YT-1S Chart Recorder 070-6270-04 NOTE: This manual is intended for YT-1/YT-1S Chart Recorders serial numbers B030500 and higher, or units that have been upgraded to that level (to identify upgrade, see page 8-5 and note frame cutout next to print head). For instruments with serial numbers B030499 and lower that have not been upgraded, please contact your local Tektronix Customer Service Representative for information regarding module exchange service. Information in this publication supercedes that in all previously published material. Box 1000, Wilsonville, OR 97070­1000 TEKTRONIX, TEK, and YT-1 / YT-1S are registered trademarks of Tektronix, Inc. WARRANTY Tektronix warrants that this product will be free from defects in materials and workmanship for a period of one (1) year from the date of shipment. [. . . ] Reset Recorder to Quiescent State This write command resets the recorder to a quiescent state waiting for the host to send a command. After reset the host should still check the status lines before sending a command to insure the recorder is ready. 5­4 YT-1 / YT-1S Chart Recorder Theory of Operations Individual Read Command Operation Read Recorder Identify Code This read command operation allows the host to identify the recorder and insure that it is properly inserted into the host unit. Read Recorder Status Codes This read command operation allows the host to insure that the recorder is ready to accept the desired command. The host must always wait until the recorder is ready before sending a command. By checking the corresponding status line or lines the host can determine recorder readiness. There are status lines for Ready to Print (D6), Ready to Advance (D4), Ready to Accept Data (D5), and Recorder Fault (D7). Only send commands when the recorder is ready. Protocol Introduction This protocol is designed for the Tektronix YT-1/YT-1S bit map only thermal dot matrix recorder. The Tektronix YT-1/YT-1S chart recorder produces a hard copy record on thermally activated paper of data provided through a parallel digital interface. The bit map (dot matrix) data is provided one byte at a time (1 byte = 8 bits) line by line (1 print line = 48 bits). This allows any combination of dots to be printed including alpha-numeric characters and graphics. Each dot corresponds to one element of a thermal printhead with a resolution of 200 dots per inch (8 dots per mm). Printing is achieved by energizing the individual elements of the printhead. YT-1 / YT-1S Chart Recorder 5­5 Theory of Operations Interface Information The YT-1/YT-1S chart recorder communicates to the host system via the host's address and data bus. The interface includes four address lines, eight data lines, one interrupt line, and three control lines. Inputs and Outputs The following signal descriptions apply to the host-to-recorder interface. Refer to the following table for pin designations (see Interface Pin Structure). A0 ­ A3 (INPUT): D0 ­ D7 (INPUT): (INPUT): (INPUT): (INPUT): (OUTPUT): Address lines from the host for the read and write operations to the recorder (all lines active high). Bidirectional data lines for the read and write operations to the recorder (all lines active high). Interrupt request line from the recorder (active low). Interface Pin Structure The interface pin structure table along with the associated waveforms are in the Maintenance section of this manual. Information about the operation of these pins is available under Option Port Interface in the Circuit Description section of the 1502B and 1503B Service manuals. 5­6 YT-1 / YT-1S Chart Recorder Theory of Operations Interface Characteristics Characteristic Connector Performance Required 25-pin male D-shell (Holmberg HYM25A28AP or equiv. ) As defined under heading: Protocol 74HC CMAS or equiv. 4ms typical < 5µs typical < 5µs typical Supplemental Info Protocol Logic Interface Print Initiation Command Execution Times Print Command Advance Load Data Byte Latch Printhead Data IR = Pin 7 General Interrupt Operations The recorder generates an interrupt request (IR) each time the record push button is depressed. This signal does not disable communication between the host and the recorder, thus allowing read and write operations to continue even though an interrupt request has been received. General Command Operations All commands are sent from the host to the recorder over the address interface bus (A0 - A3). All commands are accompanied by a low strobe of the recorder select line from the host (RS). [. . . ] The active low trigger line (pin14 on the 25-pin ``D'' connector) is unused in the diagnostic. The function of the line can be tested by momentarily grounding it to exit the diagnostic and return to the Option Port menu. 7­10 YT-1 / YT-1S Chart Recorder Maintenance Pin 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 In/Out In/Out In/Out In/Out In/Out In/Out In/Out Input Input Input Input ­­­­ ­­­­ Input Input ­­­­ ­­­­ Input ­­­­ Output Not used Designation D2 D3 D4 D5 D6 D7 A0 A1 A2 A3 Reserved Reserved +16 V +16 V 16 V Return 16 V Return +5 V 5 V Return IR Function (Status) Data Line 2 (active high) Data Line 3 (active high) Data Line 4 (active high) Data Line 5 (active high) Data Line 6 (active high) Data Line 7 (active high) Address Line 0 (active high) Address Line 1 (active high) Address Line 2 (active high) Address Line 3 (active high) Reserved for host Reserved for host +16 VDC Power (motor/print) +16 VDC Power (motor/print) 16 VDC Return (Power GND) 16 VDC Return (Power GND) +5 VDC Power (Logic) 5 VDC Return (logic GND) INTERRUPT REQUEST (active low) YT-1 / YT-1S Chart Recorder 7­11 Maintenance Pin 5 4 3 2 1 In/Out Input Input Input In/Out In/Out Designation RS RD WR D0 D1 Function (Status) RECORDER SELECT (active low) DATA READ (active low) DATA WRITE (active low) Data Line 0 (active high) Data Line 1 (active high) J2 on ECB ­ Thermal Printhead Output J2, Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Data Present +5 VDC ± 0. 5 V +16 VDC ± 1. 5 V +16 VDC ± 1. 5 V +5 VDC ± 0. 5 V Ground Ground 5 V 500Hz Square Wave 5 V 500Hz Square Wave 5 V Data Stream 5 V Data Stream 5 V Data Stream No connection +5 VDC ± 0. 5 V +5 VDC ± 0. 5 V 7­12 YT-1 / YT-1S Chart Recorder Maintenance J3 on ECB ­ Motor Drive Connector J3, Pin No. 1 2 3 4 Data Present 16 V Data Stream 16 V Data Stream 16 V Data Stream 16 V Data Stream Shipping Instructions If possible, reuse the original packaging materials. If this is not possible, use a carton with inside dimensions of no less than six inches for cushioning materials, or obtain a shipping carton from an authorized Tektronix Service Center. Shipping Carton Test Strength Gross Weight (lb) 0 ­ 10 10 ­ 30 30 ­ 120 120 ­ 140 140 ­ 160 Carton Test Strength (lb) 200 275 375 500 600 1. [. . . ]