rs-485 through parport?
- Wolfmansbrother
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21 Nov 2016 20:58 #83098
by Wolfmansbrother
rs-485 through parport? was created by Wolfmansbrother
I have a few pins left on my breakout board and i want to try using the rs-485 coms on my hyvfd.
Do I HAVE to have one of those usb => Rs + & , or can I use the extra pins?
loadusr -Wn vfd hy_vfd -n vfd -d "****" -p none -r 9600
I imagine that where the usb/dev would be, i can specify pins instead? Maybe I am over simplifying the issue and don't understand how rs-485 communicates. This breakout board can use inverted signals for the rs-
Do I HAVE to have one of those usb => Rs + & , or can I use the extra pins?
loadusr -Wn vfd hy_vfd -n vfd -d "****" -p none -r 9600
I imagine that where the usb/dev would be, i can specify pins instead? Maybe I am over simplifying the issue and don't understand how rs-485 communicates. This breakout board can use inverted signals for the rs-
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21 Nov 2016 21:30 #83099
by Wolfmansbrother
Replied by Wolfmansbrother on topic rs-485 through parport?
I could put -d /dev/parport0, but how can i further specify the rs+ and rs- pins.
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- tommylight
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22 Nov 2016 02:29 #83107
by tommylight
Replied by tommylight on topic rs-485 through parport?
The parallel port is a parallel device, meaning it can send signals to any of it's pins regardless of what other pins are doing. RS485 is a serial device, meaning it has to send a series of signals through 2 wires and wait for a response from the receiving end.
So the answer is no, you can not use the paraport to communicate with an rs485, you do need a USB to RS485 for that.
So the answer is no, you can not use the paraport to communicate with an rs485, you do need a USB to RS485 for that.
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22 Nov 2016 12:57 #83123
by cncbasher
Replied by cncbasher on topic rs-485 through parport?
RS485 is a serial protocol over either a serial port (com port ) or USB with a suitable rs485 convertor , both work well with Huyang VFD'S , search Modbus suitable code for these vfd's is already available and incorporated in LCNC
A Parallel port is totally different and cannot be used for communication
A Parallel port is totally different and cannot be used for communication
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