Difference between revisions of "20ma current loop to RS-232 conversion"
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I built the circuit described above from the altairclone site. I found the Teletype 101 article helpful for identifying the proper terminal strip locations. The interface works. I set baud to 110, with 7 bits and 'mark' parity in TeraTerm on a windows 8 notebook with a Gigaware USB<> serial convereter. | I built the circuit described above from the altairclone site. I found the Teletype 101 article helpful for identifying the proper terminal strip locations. The interface works. I set baud to 110, with 7 bits and 'mark' parity in TeraTerm on a windows 8 notebook with a Gigaware USB<> serial convereter. | ||
| + | ===Schematic 1.1=== | ||
| + | From the original schematic at altairclone I added ASR terminal strip location numbers. | ||
| + | |||
| + | [[File:RS-232 to ASR-33 Teletype Interface Schematic v1.1.jpg]] | ||
| + | ===Wiring legend=== | ||
<source lang="text"> | <source lang="text"> | ||
| − | + | screw wire schematic | |
| − | Signal | + | Signal terminal color connection |
| + | (Teletype 101 nomenclature) (on ASR) (mine) (altair clone nomenclature) | ||
--------------------------------------------------------------------- | --------------------------------------------------------------------- | ||
| − | Transmitted data send (+) | + | Transmitted data send (+) 7 orange Data to Teletype + |
| − | Transmitted data return (-) | + | Transmitted data return (-) 6 brown Data to Teletype - |
| − | Received data send (+) | + | Received data send (+) 4 red Data from Teletype + |
| − | Received data return (-) | + | Received data return (-) 3 black Data from Teletype - |
</source> | </source> | ||
| − | + | ===Image details=== | |
[[File:My Altairclone TTY-RS232 Interface.png|600px]] | [[File:My Altairclone TTY-RS232 Interface.png|600px]] | ||
[[File:Teletype Model 33 ASR terminal block.png|600px]] | [[File:Teletype Model 33 ASR terminal block.png|600px]] | ||
Latest revision as of 09:36, 21 August 2015
Contents
20ma current loop <> RS-232 conversion
Vintage PCB
Dig this crazy circuit board man! Still in it's original packaging from Hobby World Electronics in Northridge California.
Additional Resources
- Helpful article, Teletype 101 from vintagecomputer.net
- Another circuit. From [Altairclone] Specifically designed to fit in a Teletype model 33 using only a 12vdc wall wart for power.
- Another circuit I found referenced on the greenkeys email list
My ASR hookup
I built the circuit described above from the altairclone site. I found the Teletype 101 article helpful for identifying the proper terminal strip locations. The interface works. I set baud to 110, with 7 bits and 'mark' parity in TeraTerm on a windows 8 notebook with a Gigaware USB<> serial convereter.
Schematic 1.1
From the original schematic at altairclone I added ASR terminal strip location numbers.
Wiring legend
screw wire schematic
Signal terminal color connection
(Teletype 101 nomenclature) (on ASR) (mine) (altair clone nomenclature)
---------------------------------------------------------------------
Transmitted data send (+) 7 orange Data to Teletype +
Transmitted data return (-) 6 brown Data to Teletype -
Received data send (+) 4 red Data from Teletype +
Received data return (-) 3 black Data from Teletype -
Image details
