Debugging RS232 in ST

[Mariano DM]

I'm trying to communticate to tcpser in my pi via RS232. Although I loaded the alternate driver HSMOD v6. It seems I cannot get any communication, tweaked both sides to same settings (9600 baud, no flow, no parity).

 

I can even see the settings in the control panel, but no data passing through.

 

Do you know if it requires a null modem cable instead of just a gender changer?

 

Thanks.

 

 

[snarkdluG]

2 computers without modems needs a null modem cable to be able to talk to each other. It flips some wires in the cable, for example the send is connected to receive in the other end, handshaking, carrie detect and so on.

Edited June 16, 2019 by snarkdluG

[Mariano DM]

Guess so, but in the Pi side I’m running a modem emulator. It responds to AT commands. My concern is that both the cable and the Atari DB25 connector were male adapters.

 

Probably I’ll have to test the pins to make sure it matches 

[Mariano DM]

Null modem it was ! Got the right adapter and my ST is online!

 

thanks for the pointers.

M

[snarkdluG]

Glad to hear it worked out. 

[+Bikerbob]

So on your Pi are you just running Raspbian and then TCPser on it?? is there any config you could share?

 

James

[Mariano DM]

Sure! 

Correct, you don’t even need full raspbian, any small server will do.

 

I think the only special thing I did was to disable the flow control.

 

&K0

 

I followed this guide 

https://www.insentricity.com/a.cl/215/putting-your-retro-computer-on-the-line

 

And this, but usb instead of UART

 

 

http://podsix.org/articles/pimodem/

[Mariano DM]

Plus, I can use it for both the ST and 8bit. Now if I could find a RS232 interface for Spectrum;)