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Forum Index : Microcontroller and PC projects : Can someone tell me what specifically this doodad is for?
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thwill Guru  Joined: 16/09/2019 Location: United KingdomPosts: 4311 |
... and (1) whether it is generally useful and (2) whether it needs some sort of driver.  I *think* I bought it to update the firmware on my "toy" DSO-138, only to find out that it was already running the latest firmware ... alas not terribly well  Best wishes, Tom MMBasic for Linux, Game*Mite, CMM2 Welcome Tape, Creaky old text adventures |
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Turbo46 Guru Joined: 24/12/2017 Location: AustraliaPosts: 1642 |
It looks to me like an up market USB to TTL RS232 converter with CTS and RTS like a 'real' RS232 device would have. But I've not seen one like it. Bill Keep safe. Live long and prosper. |
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TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 6283 |
The main chip should have some designation on it. If not, plug it in to your RPi and look at DMESG and see what it what found as. VK7JH MMedit |
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hitsware2 Guru Joined: 03/08/2019 Location: United StatesPosts: 719 |
https://ftdichip.com/products/vdrive2/ Edited 2021-02-01 20:52 by hitsware2 my site |
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| robert.rozee Guru Joined: 31/12/2012 Location: New ZealandPosts: 2442 |
it is one of these: https://www.ebay.com/itm/183699379289 "USB To RS232 TTL CH340G Converter Module" it will nicely connect your MX170 chip running mmbasic to a PC. cheers, rob :-) |
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lew247 Guru Joined: 23/12/2015 Location: United KingdomPosts: 1702 |
It will also power the device being talked to as well by using either the 5v or 3.3v pin and ground |
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Plasmamac Guru Joined: 31/01/2019 Location: GermanyPosts: 579 |
Yap , usb to rs232 adapter. Plasma |
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| thwill Guru Joined: 16/09/2019 Location: United KingdomPosts: 4311 |
Thanks, so now I know what it's called. Now, beyond the obvious "it converts to/from USB and RS232", what is it for ?  Would I be wrong in assuming that if I (without any intervening circutry?) tie the CMM2's COM1 (or COM2) RX/TX and GND lines to this module that I can then use it to connect another PC terminal program to the CMM2 and read/write over a file-descriptor opened on the CMM2 with OPEN "COM1:115200,8192" AS #1 ? (Sometimes I regret the arrival of the CMM2 because it has almost completely distracted me from my hardware/electronics journey.) Best wishes, Tom Edited 2021-02-01 23:10 by thwill MMBasic for Linux, Game*Mite, CMM2 Welcome Tape, Creaky old text adventures |
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| lizby Guru Joined: 17/05/2016 Location: United StatesPosts: 3378 |
Looks like the standard "USB to Serial USB to TTL FT232 CH340G Adapter Gold" of which I have perhaps 2 dozen. Yes, connection to a Micro-/Maxi- Mite serial port is one of the uses (in many cases, watch the 5V/3V link--some devices can be damaged if used with 5V TTL levels on Rx and Tx). I use them to program PICAXEs (through a converter module), to connect PICAXEs with sensors to little router boxes running OpenWrt Linux, to connect any serial device to a PC running TeraTerm or puTTY or other terminal program, to provide console I/O on many Linux devices, to do serial out in one PC program to serial in on another or between two PCs (as with my interrupted MMBasic DOS debugger program). I've found them to be inexpensive and reliable (though occasionally, one just dies), and the CH340 drivers are pre-installed in Win10. ~ Edited 2021-02-01 23:40 by lizby PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed |
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| JohnS Guru Joined: 18/11/2011 Location: United KingdomPosts: 4044 |
Yes, that sort of thing should work. As you'll already have power to the CMM2 just connect TX, RX & GND on your device (and set for 3.3V operation I think). You need GND because TX & RX are relative to it. John Edited 2021-02-01 23:38 by JohnS |
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| thwill Guru Joined: 16/09/2019 Location: United KingdomPosts: 4311 |
So the TTL in the device name is actually misleading because its operating level isn't always TTL signal level it is controlled by that jumper ? Thanks, Tom MMBasic for Linux, Game*Mite, CMM2 Welcome Tape, Creaky old text adventures |
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| lizby Guru Joined: 17/05/2016 Location: United StatesPosts: 3378 |
The Rx & Tx high levels are TTL 5V or TTL 3V3 depending on the jumper. Not traditional RS232 levels, which could be up to +/- 15V. PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed |
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| thwill Guru Joined: 16/09/2019 Location: United KingdomPosts: 4311 |
OK, it's clear now. Thank you for everybody's comments. Best wishes, Tom MMBasic for Linux, Game*Mite, CMM2 Welcome Tape, Creaky old text adventures |
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| TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 6283 |
To complete the story, TTL is inverted to the normal RS232, not just different levels. To convert from TTL to RS232, you require a MAX232 or similar. Most micros require TTL so it is ideal to have in the collection. Jim VK7JH MMedit |
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