A coupling cap is a series cap. There is no series cap in the DAMs. Hence, the 1 Hz HP filter in the filter section...
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Can the designer help?
Something like that happened to me when txd and rxd wires were mixed up, needed to be txd to rxd and vice versa
Something like that happened to me when txd and rxd wires were mixed up, needed to be txd to rxd and vice versa
Checked several times, seems to me they are correct: green to RXD and white to TXD.
Are you using the ISO RXD and ISO TXD pins on J3 header for this? These are for TTL level, the manual really needs to explain this better.
Someone also mentioning a problem using that blue interface with dam1021 here, isolated input expects 3.3V levels, could it be outputting 5V levels?
Someone also mentioning a problem using that blue interface with dam1021 here, isolated input expects 3.3V levels, could it be outputting 5V levels?
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I have used J10 RXD-TXD.
I have read the post you have pointed out.
The same problem but it looks like there was no reply.
I have read the post you have pointed out.
The same problem but it looks like there was no reply.
Do you have the rev7 board with TTL-RS232?I have used J10 RXD-TXD.
I have read the post you have pointed out.
The same problem but it looks like there was no reply.
I once had similar experiences with a mainboard with TTL-RS232 ports. I had to invert the levels to get the correct output (the logic levels of real RS232 are inverted).
I don't know the revision, where can I get the rev number?
Now I'm using ISO RX/TX of J3, it looks like TerTerm receives correctly but there is a trasmission issue.
Now I'm using ISO RX/TX of J3, it looks like TerTerm receives correctly but there is a trasmission issue.
On the homepage is a picture of the Rev7 board.I don't know the revision, where can I get the rev number?
Soekris Audio ApS, Products dam1021
And maybe Soren should update the manual;-)
Then it is clear you have the wrong USB adapter. You need one with a real RS232, for example this one:
https://www.amazon.com/dp/B0753HBT12/ref=sr_1_1_sspa?__mk_de_DE=ÅMÅŽÕÑ&crid=2O5L3ODLHZCH2&dchild=1&keywords=usb+rs232+adapter&qid=1630423766&sprefix=USB+rs232%2Caps%2C235&sr=8-1-spons&psc=1&smid=A22IT5YXEXLEXM&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUFXT1hXWVhWTzdXSDMmZW5jcnlwdGVkSWQ9QTAzNjIzODQzUUs2U1MxSVhBUEomZW5jcnlwdGVkQWRJZD1BMDI3MDg4NTJQUjVUOFZQUjhFUUMmd2lkZ2V0TmFtZT1zcF9hdGYmYWN0aW9uPWNsaWNrUmVkaXJlY3QmZG9Ob3RMb2dDbGljaz10cnVl
https://www.amazon.com/dp/B0753HBT12/ref=sr_1_1_sspa?__mk_de_DE=ÅMÅŽÕÑ&crid=2O5L3ODLHZCH2&dchild=1&keywords=usb+rs232+adapter&qid=1630423766&sprefix=USB+rs232%2Caps%2C235&sr=8-1-spons&psc=1&smid=A22IT5YXEXLEXM&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUFXT1hXWVhWTzdXSDMmZW5jcnlwdGVkSWQ9QTAzNjIzODQzUUs2U1MxSVhBUEomZW5jcnlwdGVkQWRJZD1BMDI3MDg4NTJQUjVUOFZQUjhFUUMmd2lkZ2V0TmFtZT1zcF9hdGYmYWN0aW9uPWNsaWNrUmVkaXJlY3QmZG9Ob3RMb2dDbGljaz10cnVl
The one you have pointed out uses the same Prolific PL-2303 Chipset, so I don't think it will solve the issue.
Chipset doesn't necessarily matter, voltage and polarity matter. My understanding of serial comms is that the same chipsets can run both 3.3-5V TTL and 'proper' ±13V RS232 depending on the surrounding circuitry.
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