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33 lines
2.6 KiB
Markdown
33 lines
2.6 KiB
Markdown
# interface1
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A serial attached Arduino interface using the National Semiconductor DP8340 and DP8341.
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## Schematic
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## Materials
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This interface requires an [Arduino Mega](https://store.arduino.cc/usa/mega-2560-r3).
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Item | Quantity | Description | Reference | Part Number | Source
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:----:|---------:|-------------------------------|-----------|-------------------------------|----------------
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1 | 1 | IBM 3270 Protocol Transmitter | U1 | National Semiconductor DP8340 | eBay - Obsolete
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2 | 1 | IBM 3270 Protocol Receiver | U2 | National Semiconductor DP8341 | eBay - Obsolete
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3 | 1 | Quad RS-422 Line Driver | U3 | Texas Instruments DS3487 | eBay - Obsolete
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4 | 1 | Pulse Transformer - 1:1:1 | T1 | Pulse PE-5762 | eBay - Obsolete
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5 | 1 | Crystal - 18.867 MHz | Y1 | IQD LFXTAL057125 * | [Mouser](https://www.mouser.com/ProductDetail/IQD/LFXTAL057125Bulk?qs=%2Fha2pyFaduieSzBxw7UAJRZlCXjBZuIKPyofrMyYW7wVunrhuBMeiQd4MCF50LLz)
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6 | 2 | Resistor - 33 ohm | R2, R4 | | [Mouser](https://www.mouser.com/ProductDetail/Xicon/271-33-RC?qs=sGAEpiMZZMu61qfTUdNhGzoeXLT9qgk%252BV159XfY8c4Q%3D)
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7 | 1 | Resistor - 120 ohm | R6 | | [Mouser](https://www.mouser.com/ProductDetail/Xicon/271-120-RC?qs=sGAEpiMZZMu61qfTUdNhG7Of23Pr6gu8rRE5UXBJoDw%3D)
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8 | 2 | Resistor - 150 ohm | R1, R5 | | [Mouser](https://www.mouser.com/ProductDetail/Xicon/271-150-RC?qs=sGAEpiMZZMu61qfTUdNhG2ZzrN2CiS9nBcPQNrtAXYk%3D)
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9 | 1 | Resistor - 500 ohm | R7 | | [Mouser](https://www.mouser.com/ProductDetail/Xicon/271-499-RC?qs=sGAEpiMZZMu61qfTUdNhG6lpw21m8SOsvE2iEnaSg1s%3D)
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10 | 1 | Resistor - 510 ohm | R3 | | [Mouser](https://www.mouser.com/ProductDetail/Xicon/271-510-RC?qs=sGAEpiMZZMu61qfTUdNhG9RrhBeDi8B8FBVTnOgGHiw%3D)
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11 | 1 | Capacitor - 30pF | C1 | | [Mouser](https://www.mouser.com/ProductDetail/Vishay-Cera-Mite/561R10TCCQ30?qs=sGAEpiMZZMt1mVBmZSXTPNbSVgF1iSv4q4pBhPBLwuM%3D)
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12 | 1 | Coax Connector | J1 | |
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\* - SMD
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## Firmware
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The firmware currently provides the ability to send commands and receive responses - it is designed to be used to implement a terminal controller, not to emulate a terminal.
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