serial cable
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Posts: 46,084
Hi
If I understand you right, you say that you use the shield of your
cable for GND (signal and protective). With the long 200ft cable in
mind, I would use a separate wire (inside the shield) for signal GND
and leave the shield for protective GND. Don't use the shield for
signal GND in a noisy environment.
Appart from that, I think using caps is a good idea - look at
http://www.emesystems.com/BS2rs232.htm#resets
for a circuit diagram.
hope this helps
Adrian
If I understand you right, you say that you use the shield of your
cable for GND (signal and protective). With the long 200ft cable in
mind, I would use a separate wire (inside the shield) for signal GND
and leave the shield for protective GND. Don't use the shield for
signal GND in a noisy environment.
Appart from that, I think using caps is a good idea - look at
http://www.emesystems.com/BS2rs232.htm#resets
for a circuit diagram.
hope this helps
Adrian
Comments
the cable I am using 4 wires, serial in, serial out, ATN and ground which is
the shield. I also have a jumper on the ATN line so the PC will not reset the
stamp when it is shut down. I am getting spuratic events when plugging and
unplugging the cable, like lock ups and resets. The ground on the stamp side is
not an earth ground, just a dc ground on the board which is not earth grounded
either. What is the preferred method for making this connection or cable? It
would be an earth ground on the PC side of the cable. Would caps or resistors
help in any way? Oh the cable is about 200ft long. I know this seems long but
the data gets there flawlessly. It never misses a beat. Thanks in advance!
[noparse][[/noparse]Non-text portions of this message have been removed]
wrote:
> I have a stamp sending data to a PC in a noisy industrial
environment. Inside the cable I am using 4 wires, serial in, serial
out, ATN and ground which is the shield. I also have a jumper on
the ATN line so the PC will not reset the stamp when it is shut
down. I am getting spuratic events when plugging and unplugging the
cable, like lock ups and resets. The ground on the stamp side is not
an earth ground, just a dc ground on the board which is not earth
grounded either. What is the preferred method for making this
connection or cable? It would be an earth ground on the PC side of
the cable. Would caps or resistors help in any way? Oh the cable is
about 200ft long. I know this seems long but the data gets there
flawlessly. It never misses a beat. Thanks in advance!
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
If I read this right, I intrepret that you have a 3-
conductor,shielded cable. Also. you state that the stamp gound is
just VSS and not tied to earth ground and that the shield of the
cable is tied to the stamp VSS. I would try a 4-conductor,shielded
cable and tie the shield of the cable to the chassis ground/frame of
the PC.
--Guy
200 feet may be OK without noise but it may still be marginal.
Try a Ferrite Core on each end. If this doesn't work then the safest thing to
do is use a Short Haul Modem. I use them on my Industrial CNC machines. The
noise can kill the PC Serial port (Expensive$) or even destroy the serial
port in the CNC (Very Expensive$$$) The other thing to think about is
Lightning. The Steel trusses used in many factory roofs make good conductors
of Lightning Strikes. I repaired a customers system last year. The Lightning
struck a far end of the building, but totally fries the PC on one end and did
$5,000 damage to the CNC (In our case the CNC is the Stamp).
The Short Haul Modems use opto-isolators for safety and Current Loop between
modems for Data Integrity.
Wire systems are cheaper, but the fiber system is much better.
A 200 foot fiber system will cost less than $1,000. Much cheaper than repair
bills, and don't forget down time does cost you money.
Look to <A HREF="www.blackbox.com">www.blackbox.com</A>
Alan Bradford
Plasma Technologies
[noparse][[/noparse]Non-text portions of this message have been removed]
ground for the stamp.
Depending on what you have available to you for wire, I suggest you use two
individual runs of TWISTED shielded twin.
Do NOT ground the shields at both ends. Ground at computer end only.
If these don't work, why not consider an FRO link?
For more information on data cabling, try a google search on CSDB
(commercial standard data bus). The info that you will find on such a search
will be aircraft databus standard wiring, which typically is long low speed
databus runs in electrically noisy environments.
Regards,
Dwain
Original Message
From: "Ricky Konvicka" <ricky@m...>
To: <basicstamps@yahoogroups.com>
Sent: Saturday, January 18, 2003 4:08 AM
Subject: [noparse][[/noparse]basicstamps] serial cable
> I have a stamp sending data to a PC in a noisy industrial environment.
Inside the cable I am using 4 wires, serial in, serial out, ATN and ground
which is the shield. I also have a jumper on the ATN line so the PC will
not reset the stamp when it is shut down. I am getting spuratic events when
plugging and unplugging the cable, like lock ups and resets. The ground on
the stamp side is not an earth ground, just a dc ground on the board which
is not earth grounded either. What is the preferred method for making this
connection or cable? It would be an earth ground on the PC side of the
cable. Would caps or resistors help in any way? Oh the cable is about
200ft long. I know this seems long but the data gets there flawlessly. It
never misses a beat. Thanks in advance!
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
>
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of a pair on inner cables with each having: insulated inner conductor,
wrapped wire shield, outer polyvinyl insulator. It comes in lengths of
6', 15' and 25'.
Dennis
Original Message
From: Dwain J. Hill [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=f1Pgmm-5j6BbMQhuu_NYN4bcURIvhQrcd25LakCDM-rUHY1omhAOooo2bgV_JIE-qha9y_kofFTwMazdr4Oc]dwainsworld@e...[/url
Sent: Saturday, January 18, 2003 3:13 PM
To: basicstamps@yahoogroups.com
Subject: Re: [noparse][[/noparse]basicstamps] serial cable
I agree with what the other guys have said, don't run your shield as the
ground for the stamp.
Depending on what you have available to you for wire, I suggest you use
two individual runs of TWISTED shielded twin.
Do NOT ground the shields at both ends. Ground at computer end only.
If these don't work, why not consider an FRO link?
For more information on data cabling, try a google search on CSDB
(commercial standard data bus). The info that you will find on such a
search will be aircraft databus standard wiring, which typically is long
low speed databus runs in electrically noisy environments.
Regards,
Dwain
Original Message
From: "Ricky Konvicka" <ricky@m...>
To: <basicstamps@yahoogroups.com>
Sent: Saturday, January 18, 2003 4:08 AM
Subject: [noparse][[/noparse]basicstamps] serial cable
> I have a stamp sending data to a PC in a noisy industrial environment.
Inside the cable I am using 4 wires, serial in, serial out, ATN and
ground which is the shield. I also have a jumper on the ATN line so the
PC will not reset the stamp when it is shut down. I am getting spuratic
events when plugging and unplugging the cable, like lock ups and resets.
The ground on the stamp side is not an earth ground, just a dc ground on
the board which is not earth grounded either. What is the preferred
method for making this
connection or cable? It would be an earth ground on the PC side of the
cable. Would caps or resistors help in any way? Oh the cable is about
200ft long. I know this seems long but the data gets there flawlessly.
It never misses a beat. Thanks in advance!
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
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leave the serial cable in position at eatch site. Therefore, what is
the cable configuratin so that I can purchase a new one localy.
Satchid
satchid@p... writes:
> I need to operate a basic stamp on 2 different locations. I want to
> leave the serial cable in position at eatch site. Therefore, what is
> the cable configuratin so that I can purchase a new one localy.
> Satchid
>
Just ask for a standard serial cable. Make sure it is not a null modem
cable.
Sid Weaver
W4EKQ
Port Richey, FL
[noparse][[/noparse]Non-text portions of this message have been removed]
You need a DB-9 Male to DB-9 Female cable,
with all 9-pins wired STRAIGHT-Through.
This is sometimes called a Serial Mouse
Extension Cable, or a Modem Connection
Cable.
Do NOT use a 'Null-Modem' cable -- this is
not wired the way you need for the BS2.
--- In basicstamps@yahoogroups.com, "satchid23" <satchid@p...> wrote:
> I need to operate a basic stamp on 2 different locations. I want to
> leave the serial cable in position at eatch site. Therefore, what
is
> the cable configuratin so that I can purchase a new one localy.
> Satchid
Original Message
From: Allan Lane [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=HpS_n66Reta1X_tkSFyQI0Z_AFSyaH5oe4C0EJXvpmt7uX6Aidc9yn2vvD2BjEaNzNKWAF7mLiaQD8J_0OVG9TrFGmI]allan.lane@h...[/url
Sent: woensdag 11 februari 2004 15:22
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Re: serial cable
Yes, I do this myself.
You need a DB-9 Male to DB-9 Female cable,
with all 9-pins wired STRAIGHT-Through.
This is sometimes called a Serial Mouse
Extension Cable, or a Modem Connection
Cable.
Do NOT use a 'Null-Modem' cable -- this is
not wired the way you need for the BS2.
--- In basicstamps@yahoogroups.com, "satchid23" <satchid@p...> wrote:
> I need to operate a basic stamp on 2 different locations. I want to
> leave the serial cable in position at eatch site. Therefore, what
is
> the cable configuratin so that I can purchase a new one localy.
> Satchid
To UNSUBSCRIBE, just send mail to:
basicstamps-unsubscribe@yahoogroups.com
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