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serial connection and hardware flow control

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serial connection and hardware flow control

Postby watiss » Tue Aug 06, 2013 7:26 am

Hi all.
I've got a general question concerning serial connection (I'm sort of a newbe in hardware and am having trouble managing a serial connection for a while now :( ) : does anyone know what hold_rx and hold_tx signals might stand for?
The datasheet I've got doesn't give enough information on that :? It just says the hold_* input pins are used to impelement hardware handshake of transmit direction, and we're not using any hardware flow control... So, should I put these input pins to high or to low??
Thank you in advance, this problem is really blokcing me :cry: ...
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Re: serial connection and hardware flow control

Postby Martyn » Tue Aug 06, 2013 8:41 am

Look up Ready to Send (RTS) and Clear to Send (CTS) which is the more common term
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Re: serial connection and hardware flow control

Postby watiss » Tue Aug 06, 2013 9:02 am

Thanks for your answer :)
You're rigt. Actually, I hadn't considered that! But then, even assuming that these hold_rx and tx signals are in fact the rts ans cts signals, should I put them to 0 or 1 (or float) if we're not using any hardware flow control :| ?
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Re: serial connection and hardware flow control

Postby Martyn » Tue Aug 06, 2013 10:44 am

If you are not using hardware flow control it should configure the chips to take no notice of these lines.
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Re: serial connection and hardware flow control

Postby watiss » Tue Aug 06, 2013 11:22 am

Actually, the problem seems still seems to come from the hardware : I've been trying to send simple characters through a terminal application to my board (I let drop the very complex application I had previously been working on, just to make sure that the problem didn't come from the software). The characters I've sent are supposed to configure my board with a certain configuration (mentioned by my technical support contact) but we're still not receiving anything from the board (it is supposed to answer with two specific bytes, but there's nothing received :s ). So I think the problem must be with our connections, that we have re-tested and which seem OK though!
For what regards the configuration of the chip in order not to consider the RTS/CTS signals, I think this should also be done within hardware since the technical support advised me to put the RTS/CTS pins to GND and just send the hexa characters and wait for the board to answer (but it doesn't answer)...
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Re: serial connection and hardware flow control

Postby Martyn » Tue Aug 06, 2013 1:16 pm

You are asking questions about a specific product, you need to ask these questions of the developers of the product. What is this board you are trying to communicate with ?
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Re: serial connection and hardware flow control

Postby watiss » Wed Aug 07, 2013 1:00 pm

I'm trying to communicate with an interface board we have ordered from another company and that we're trying to reach and configure within our own CPUs...
But you're right, I think the person who can help me is my technical support contact, and in fact I did contact him yesterday and we (finally!!) managed to establish the serial connection with the board (in fact we had to put the hold inputs to 0... and if it didn't work before, it was a matter of the channel itself which had a problem !!!) So it's OK now. I'm on a new "mission" with this board now (a bit more complicated though ^^) Thanks anyway for your answers :wink:
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Re: serial connection and hardware flow control

Postby watiss » Wed Aug 07, 2013 1:15 pm

Oh and how should I mark the thread as resolved please?
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Re: serial connection and hardware flow control

Postby Hitesh » Wed Aug 14, 2013 1:51 pm

Hi watiss,

You can indicate it as being resolved in your post :D

Regards,
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