Odd question, maybe....
I would like to have my ECU connected ot my Aim dash as it has the capabilities to communicate with megasquirt using the serial (RS232) port just by
connecting the TX and RX cables.
By question is, can I have both my dash and my laptop connected at the same time so I can keep an eye on boost pressure and all the other variables
real time from the ECU?
David
I wouldn't have thought so, what about one of the usb to serial converters so you have 2 com ports? Would that work?
Cheers
Rich
not unless your AIM dash has pass-through capability
So connecting 2 cables each to the TX and RX at the megasquirt end and then one set to the laptop and one to the dash isnt going to work then?
I also have to figure if you connect TX-TX and RX-RX or TX-RX, RX-TX as the aim manual is rather vague.
quote:
Originally posted by flak monkey
So connecting 2 cables each to the TX and RX at the megasquirt end and then one set to the laptop and one to the dash isnt going to work then?
I just did what was suggested above, really cheap USB to serial dongle and native serial port, just displayed two dashes on my laptop
quote:
Originally posted by mark chandler
I just did what was suggested above, really cheap USB to serial dongle and native serial port, just displayed two dashes on my laptop
quote:
Originally posted by mark chandler
I just did what was suggested above, really cheap USB to serial dongle and native serial port, just displayed two dashes on my laptop
Might work if the digidash doesn't need to use the transmit line. Split the cable and don't connect the Tx.
IIRC megasquirt is permanently putting out the data on the serial port, so depending on how the digidash works it may not need the Tx.
It could be done,
Wire the transmit from MS to the RX on the dash and PC
Since it's easier to re-write the Megatune software wire the TX from the Dash to the RX on the MS and get the dash to send the request char.
You'd need at alter Megatune to receive the reply data without sending the request, but I think it's open source isn't it?
[Edited on 1/9/09 by Doofus]
quote:
Originally posted by Doofus
It could be done,
Wire the transmit from MS to the RX on the dash and PC
Since it's easier to re-write the Megatune software wire the TX from the Dash to the RX on the MS and get the dash to send the request char.
You'd need at alter Megatune to receive the reply data without sending the request, but I think it's open source isn't it?
You may be able to do it.
It would be easy to do if you only wanted to monitor on one or the other but if you want both to have transmit capability you may be able to get by by
putting a signal diode on both of the transmit lines - one on the dash transmit and one othe laptops. This way the signal will not corrupt the others
signal.
Also depends on weather they are using control signals or just xon/xoff if they are both using just rx tx and ground you might just get away with
it.
Dale
rs232 is suposed to use + and - signals but most get by with 0 and +
quote:
Originally posted by Dale
You may be able to do it.
It would be easy to do if you only wanted to monitor on one or the other but if you want both to have transmit capability you may be able to get by by putting a signal diode on both of the transmit lines - one on the dash transmit and one othe laptops. This way the signal will not corrupt the others signal.
You've got two masters (laptop/digiview), and one slave (MS) - and you can guarantee they'll want different info...so sadly no.
I've used 3 devices on an RS232 line before, but one was a "sniffer" just to see what was going on.
A possibility is a multiplexer, so it only allows one request to the slave (MS) at a time - but beware of timeout issues as if one is waiting its
turn, the other might timeout. The other trick is going to know when the MUX needs to switch over..