Emax

Great news !

(but now you're stuck with the orders for the other ICs that you have placed :-)

If you would continue using the device based on MAX485 and the SN IC and after a few weeks of usage it would seem to be stable, just let me know. Then I can add a note to the instruction manual of the EMuSer that these ICs can be considered as alternatives for the UA ones ...

///E-Synthesist

--- In emax@yahoogroups.com, "Adam" <fake@...> wrote:
>
> IT'S WOOOOOORKING!!!!!!
> 
> i asked my friend to do the modding for me, but it seems like he made some mistake. i fixed the wires and it completed the transfer, but under Win XP only (i tried it under Parallels Desktop from OS-X). 
> 
> At first it gave an error when receiving the first bank, but after retrying everything went fine.
> 
> I'll do further investigation....
> 
> Thank You very much, ESynthesist!
> 
> Adam
> 
> > --- In emax@yahoogroups.com, "esynthesist" <esynthesist@> wrote:
> > >
> > > Indeed, the SN pin connections you mentioned are correct - this means that only on the two MAX485 the + and - signals should be swapped.
> > > Once modified I would expect that there's a big chance the circuit should work, even without any resistors and capacitors.
> > > 
> > > Except for the LED resistors and the signal shaping capacitors C4 and C5 on the EmuSer schema, the other resistors and capacitors are mainly added for signal leveling/protection purposes (avoiding too high voltages on input pins and avoiding peaks). But in normal circumstances - given the voltage range specifications of all involved ICs (the absolute maximums and the tresholds for L and H) - direct connections between the ICs should work too... I would have to double check but I think this is true both for the ICs and Teensy you have used, and the ones that are used in the EMuSer schema.
> > > I remember though that I had problems with alternative designs with more or less resistors on the board, so I decided to stick as much as possible to the original design by Julian H (co-member of this forum). 
> > > 
> > > It will be interesting to learn about any possible differences between the two schemas !
> > > 
> > > ///E-Synthesist
> > > 
> > > 
> > > 
> > > 
> > > --- In emax@yahoogroups.com, "Adam" <fake@> wrote:
> > > >
> > > > First of all, thank you for caring!
> > > > 
> > > > i had the idea, that on the MAX'es the +/- things should be swapped.
> > > > but why on the SN?
> > > > 
> > > > In the meantime i've ordered the original ICs you used from the US, because i could see these nowhere around. I'll definietly going to compare these part by part, and will let you know if we found out something!
> > > > 
> > > > thanks,
> > > > 
> > > > adam
> > > > 
> > > > --- In emax@yahoogroups.com, "esynthesist" <esynthesist@> wrote:
> > > > >
> > > > > I just did a quick comparison of the ICs you used with the ones as specified for the EmuSer. At first sight they should be compatible, although yours are a bit slower...
> > > > > 
> > > > > However when checking your connections mentioned in your message below, I think you have swapped the inverting and non-inverting pins.
> > > > > I think the RXD+/RXD- and TXD+/TXD- must be swapped on the MAX and SN ICs...
> > > > > 
> > > > > ///E-Synthesist
> > > > > 
> > > > > --- In emax@yahoogroups.com, "Adam" <fake@> wrote:
> > > > > >
> > > > > > well, it starts to make sense! it really looked disappointing, now there are new things to check. 
> > > > > > 
> > > > > > meanwhile i switched to an Emulator II+HD to do the tests, because i know that works well with SD thru DB25. is it fair to assume that it has a healthy port and will work with the EMXP too?
> > > > > > 
> > > > > > i put this back to the bench and will check if there were any signals coming in and out on the TX-RX stuff. i havent included the LEDs on this design.
> > > > > > 
> > > > > > since the UA9637AC is not available around, i replaced it. i did not use any capacitors and resistors though. i assume you used it to shape the signal (apart from those to support the LEDs). if there were any other reasons, please let me know, i need to check that.
> > > > > > 
> > > > > > i am going to list the short description of my version in a very easy way. everything is connected direct, no resistors or capacitors used. please see below if you were interested in.
> > > > > > 
> > > > > > "So, what error do you actually get in EMXP ?   "
> > > > > > 
> > > > > > When receiving from the EII it says: Errorcode 990. There is a communication problem with the EII. ReasonCode is 3.
> > > > > > 
> > > > > > i am going to post it quick, so maybe you had more time to check and think, and now i'll return to measure the circuitry.
> > > > > > 
> > > > > > and now the connections:
> > > > > > 
> > > > > > 
> > > > > > 
> > > > > > RECEIVER (RX): MAX RS485
> > > > > > ---------------------
> > > > > > TXD+ (Emax: pin8) -> Teensy RXD+ (RS422:3) -> RS485:7 (B)
> > > > > > TXD- (Emax:pin9) -> Teensy RXD- (RS422:4) -> RS485:6 (A)
> > > > > > GND (Emax:pin3) -> Teensy (RS422:5) -> RS485:5 (GND) 
> > > > > > RS485:pin1 (R0) -> Teensy PD2 (RXD1)
> > > > > > RS485:pin2 (NRE) -> L 
> > > > > > RS485:pin3 (D) -> L  
> > > > > > RS485:pin4 (DI) ->  not connected 
> > > > > > 
> > > > > > TRANSCIVER (TX): MAX RS485
> > > > > > ------------------------
> > > > > > Teensy TXD (PD3) -> RS485:pin4 (DI)
> > > > > > RS485:pin6 (A) -> Emax:pin5 (RXD-)
> > > > > > RS485:pin7 (B) -> Emax:pin4 (RXD+)
> > > > > > RS485:1 (R0) -> not connected
> > > > > > RS485:2 (NRE) ->H
> > > > > > RS485:3 (DE) ->H
> > > > > > 
> > > > > > CLOCK (CLK): SN75176B
> > > > > > ------------------------
> > > > > > CLK (Emax:5) -> SN75176B Pin6 (A) 
> > > > > > SN75176B:pin7: B -> L
> > > > > > SN75176B:pin1: R -> Teensy PD5  (XCK)
> > > > > > SN75176B:pin4 (D) -> not connected
> > > > > > SN75176B:pin3 (DE) -> L 
> > > > > > SN75176B:pin2 (NRE) -> L
> > > > > >
> > > > >
> > > >
> > >
> >
>