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lowobservable.coax/interface1
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Andrew Kay 37813a2727 Initial commit
2019-06-26 22:36:14 -05:00
..
firmware
Initial commit
2019-06-26 22:36:14 -05:00
hardware
Initial commit
2019-06-26 22:36:14 -05:00
README.md
Initial commit
2019-06-26 22:36:14 -05:00

README.md

interface1

A serial attached Arduino interface using the National Semiconductor DP8340 and DP8341.

Schematic

Schematic

Materials

This interface requires an Arduino Mega.

Item Quantity Description Reference Part Number Source
1 1 IBM 3270 Protocol Transmitter U1 National Semiconductor DP8340 eBay - Obsolete
2 1 IBM 3270 Protocol Receiver U2 National Semiconductor DP8341 eBay - Obsolete
3 1 Quad RS-422 Line Driver U3 Texas Instruments DS3487 eBay - Obsolete
4 1 Pulse Transformer - 1:1:1 T1 Pulse PE-5762 eBay - Obsolete
5 1 Crystal - 18.867 MHz Y1 IQD LFXTAL057125 * Mouser
6 2 Resistor - 33 ohm R2, R4 Mouser
7 1 Resistor - 120 ohm R6 Mouser
8 2 Resistor - 150 ohm R1, R5 Mouser
9 1 Resistor - 500 ohm R7 Mouser
10 1 Resistor - 510 ohm R3 Mouser
11 1 Capacitor - 30pF C1 Mouser
12 1 Coax Connector J1

* - SMD

Firmware

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.