Original Message
From: jack spangler <wjs@c...>
To: <basicstamps@egroups.com>
Sent: Monday, August 14, 2000 8:25 AM
Subject: Re: [noparse][[/noparse]basicstamps] UNSUBSCRIBE
unsubscribe me pls
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Original Message
From: "Al Williams" <alw@a...>
To: <basicstamps@egroups.com>
Sent: Thursday, September 14, 2000 9:12 AM
Subject: RE: [noparse][[/noparse]basicstamps] macintosh serial port connections
> Disclaimer: I know nothing (and I mean nothing) about the Mac.
>
> However here is some info from
(http://csgrad.cs.vt.edu/~tjohnson/pinouts/):
> mac serial port:
> (printer end)
> Connector: mini-circular-square-din-type connector
>
> U
> 8 7 6
> 5 4 3
> 2 1
>
> 1 handshake out (DTR?)
> 2 handshake in (RTS?)
> 3 TD-
> 4 GND
> 5 RD-
> 6 TD+
> 7 GPinput (NC on Mac plus and earlier)
> 8 RD+
>
> This is an RS-422 interface not RS-232, hence the paired IO pins (+
and -).
> To connect to an RS-232 device: attach the - pins to the RS-232 data
> pins, and RD+ to ground. The handshake in and out are the hardware flow
> control, GPinput is carrier detect.
>
>
> So you'd need a converter.
>
> Here is another pinout from
> (http://www.hut.fi/Misc/Electronics/docs/lan/mac_serial.html)
>
> Macintosh (DTE) Modem (DCE)
> DIN-8 DB-25
>
> Pin Signal Signal Pin
>
> 3 TxD-
TxD 2
>
> 4 GND ----+
GND 7
> 8 RxD+ ----'
>
> 5 RxD-
RxD 3
> 6 TxD+ (nc)
>
> /
###
\ 1 HSKo Output Handshake
> / ### \ (Zilog 8530 DTR
pin)
> / \ 2 HSKi/CLK Input Handshake
*OR*
> / [noparse][[/noparse]|] [noparse][[/noparse]|] [noparse][[/noparse]|] \ External Clock
> / 8 7 6 \ 3 TxD- Transmit data (-)
> | |
> | | 4 Ground Signal ground
> | === === === |
> | 5 4 3 | 5 RxD- Receive data (-)
> | |
> | | 6 TxD+ Transmit data (+)
> \----+ === === +----/
> \###| 2 1 |###/ 7 N/C (no connection)
> \##| |##/
> \| |/ 8 RxD+ Receive data (+)
> \
###
/
> ###
>
> However, I have also heard this:
> The serial ports use the EIA422 standard which is a 'differential' system
> using 5 volt outputs. It is possible for the Mac to accept 'single ended'
> RS232 data (on pin 5) by grounding pin 8 at the Mac end. You can usually
> send 5 volt data (from pin 3 on the Mac) to a RS232 input but the noise
> immunity will be reduced.
>
> That corresponds with the pinout above.
>
> So to summarize, ground pin 8, RX on pin 5 and transmit on pin 3.
>
> Hope that helps.
>
> Regards,
>
> Al Williams
> AWC
> * Floating point math for the Stamp, PIC, SX or any microcontroller:
> http://www.al-williams.com/awce/pak1.htm
>
>
>
>
>
Comments
Peter Sillberg
Design Engineer / Project manager
CONSAT ENGINEERING AB
Phone: +46(0)31-340 00 42
Mobile: +46(0)706-04 21 41
e-mail: peter.sillberg@c...
Internet: www.consat.se
Original Message
From: Jason Cox
To: basicstamps@egroups.com
Sent: Monday, August 14, 2000 1:19 AM
Subject: [noparse][[/noparse]basicstamps] unsubscribe
unsubscribe
Original Message
From: jack spangler <wjs@c...>
To: <basicstamps@egroups.com>
Sent: Monday, August 14, 2000 8:25 AM
Subject: Re: [noparse][[/noparse]basicstamps] UNSUBSCRIBE
>
>
>
> > UNSUBSCRIBE
>
>
>
>
>
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Original Message
From: "Al Williams" <alw@a...>
To: <basicstamps@egroups.com>
Sent: Thursday, September 14, 2000 9:12 AM
Subject: RE: [noparse][[/noparse]basicstamps] macintosh serial port connections
> Disclaimer: I know nothing (and I mean nothing) about the Mac.
>
> However here is some info from
(http://csgrad.cs.vt.edu/~tjohnson/pinouts/):
> mac serial port:
> (printer end)
> Connector: mini-circular-square-din-type connector
>
> U
> 8 7 6
> 5 4 3
> 2 1
>
> 1 handshake out (DTR?)
> 2 handshake in (RTS?)
> 3 TD-
> 4 GND
> 5 RD-
> 6 TD+
> 7 GPinput (NC on Mac plus and earlier)
> 8 RD+
>
> This is an RS-422 interface not RS-232, hence the paired IO pins (+
and -).
> To connect to an RS-232 device: attach the - pins to the RS-232 data
> pins, and RD+ to ground. The handshake in and out are the hardware flow
> control, GPinput is carrier detect.
>
>
> So you'd need a converter.
>
> Here is another pinout from
> (http://www.hut.fi/Misc/Electronics/docs/lan/mac_serial.html)
>
> Macintosh (DTE) Modem (DCE)
> DIN-8 DB-25
>
> Pin Signal Signal Pin
>
> 3 TxD-
TxD 2
>
> 4 GND ----+
GND 7
> 8 RxD+ ----'
>
> 5 RxD-
RxD 3
> 6 TxD+ (nc)
>
> /
###
\ 1 HSKo Output Handshake
> / ### \ (Zilog 8530 DTR
pin)
> / \ 2 HSKi/CLK Input Handshake
*OR*
> / [noparse][[/noparse]|] [noparse][[/noparse]|] [noparse][[/noparse]|] \ External Clock
> / 8 7 6 \ 3 TxD- Transmit data (-)
> | |
> | | 4 Ground Signal ground
> | === === === |
> | 5 4 3 | 5 RxD- Receive data (-)
> | |
> | | 6 TxD+ Transmit data (+)
> \----+ === === +----/
> \###| 2 1 |###/ 7 N/C (no connection)
> \##| |##/
> \| |/ 8 RxD+ Receive data (+)
> \
###
/
> ###
>
> However, I have also heard this:
> The serial ports use the EIA422 standard which is a 'differential' system
> using 5 volt outputs. It is possible for the Mac to accept 'single ended'
> RS232 data (on pin 5) by grounding pin 8 at the Mac end. You can usually
> send 5 volt data (from pin 3 on the Mac) to a RS232 input but the noise
> immunity will be reduced.
>
> That corresponds with the pinout above.
>
> So to summarize, ground pin 8, RX on pin 5 and transmit on pin 3.
>
> Hope that helps.
>
> Regards,
>
> Al Williams
> AWC
> * Floating point math for the Stamp, PIC, SX or any microcontroller:
> http://www.al-williams.com/awce/pak1.htm
>
>
>
>
>