Kode 375-928 Display - Help!
So off of an impulse (and low bid of $9.99) I bought a Kode 375-928 display
off eBay. No picture or anything in the auction, but I figured I would take
the chance and hopefully nobody else would bid.
A huge box came today, and guess what was inside? This display has to be
about 3 to 4 feet long! It has 12 alpha-numeric type digits (broken up in to
three groups of four).
The back interface has only a 25pin dsub connector along with jumpers for
baud rate select & address select. There's a couple more holes for
additional connectors but they are not installed.
Inside it is pretty bare, there's the power supplies, PCB for the front
display digits, then another PCB with a bunch of socketed chips which I'm
guessing is the brains.
I'll have to probe the (serial?) port tomorrow when I get to the office.
I'll also take some pictures, this thing is pretty cool looking.
So, my question is... Does anyone have any sort of experience with these
kind of Kode displays? Or just a generic hunch about the interface? I was
thinking maybe it was a BCD port, but I've never seen one with a baud rate /
address selection. The only other Kode I have uses a simple BNC input for
IRIG-B.
Jason
It might be RS-485 and so multiple displaies could have its own address on a
multidrop setup.
About the only trick there is finding out if its 2 or 4 wire 485 (probably 2
because of the address).
Think I've seen some USB to 485 converters on the market, but you might get
away with driving it with RS-232.
Go Google RS-485
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of Jason Rabel
Sent: Wednesday, May 23, 2007 6:06 PM
To: 'Discussion of precise time and frequency measurement'
Subject: [time-nuts] Kode 375-928 Display - Help!
So off of an impulse (and low bid of $9.99) I bought a Kode 375-928 display
off eBay. No picture or anything in the auction, but I figured I would take
the chance and hopefully nobody else would bid.
A huge box came today, and guess what was inside? This display has to be
about 3 to 4 feet long! It has 12 alpha-numeric type digits (broken up in to
three groups of four).
The back interface has only a 25pin dsub connector along with jumpers for
baud rate select & address select. There's a couple more holes for
additional connectors but they are not installed.
Inside it is pretty bare, there's the power supplies, PCB for the front
display digits, then another PCB with a bunch of socketed chips which I'm
guessing is the brains.
I'll have to probe the (serial?) port tomorrow when I get to the office.
I'll also take some pictures, this thing is pretty cool looking.
So, my question is... Does anyone have any sort of experience with these
kind of Kode displays? Or just a generic hunch about the interface? I was
thinking maybe it was a BCD port, but I've never seen one with a baud rate /
address selection. The only other Kode I have uses a simple BNC input for
IRIG-B.
Jason
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RS-485 is a balanced drive (i.e., 2 floating wires). It would be better to
power it up and see if the standard RS-232 signal levels are present on the
proper pins (2 & 3) before doing anything else (assuming absence of a manual).
I do not know if there is a standard pinout for RS-485 on a dsub 25 connector.
Bill....WB6BNQ
Jack Hudler wrote:
It might be RS-485 and so multiple displaies could have its own address on a
multidrop setup.
About the only trick there is finding out if its 2 or 4 wire 485 (probably 2
because of the address).
Think I've seen some USB to 485 converters on the market, but you might get
away with driving it with RS-232.
Go Google RS-485
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of Jason Rabel
Sent: Wednesday, May 23, 2007 6:06 PM
To: 'Discussion of precise time and frequency measurement'
Subject: [time-nuts] Kode 375-928 Display - Help!
So off of an impulse (and low bid of $9.99) I bought a Kode 375-928 display
off eBay. No picture or anything in the auction, but I figured I would take
the chance and hopefully nobody else would bid.
A huge box came today, and guess what was inside? This display has to be
about 3 to 4 feet long! It has 12 alpha-numeric type digits (broken up in to
three groups of four).
The back interface has only a 25pin dsub connector along with jumpers for
baud rate select & address select. There's a couple more holes for
additional connectors but they are not installed.
Inside it is pretty bare, there's the power supplies, PCB for the front
display digits, then another PCB with a bunch of socketed chips which I'm
guessing is the brains.
I'll have to probe the (serial?) port tomorrow when I get to the office.
I'll also take some pictures, this thing is pretty cool looking.
So, my question is... Does anyone have any sort of experience with these
kind of Kode displays? Or just a generic hunch about the interface? I was
thinking maybe it was a BCD port, but I've never seen one with a baud rate /
address selection. The only other Kode I have uses a simple BNC input for
IRIG-B.
Jason
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Interesting you would mention that! After my first post I pulled the board
with the connector and was looking at the traces from the DB-25. One of the
chips nearby is a SN75176AP which I found a PDF saying it is a differential
bus transceiver (RS422). I have a SBC that you can set the com port to
RS232/422/485, so that's one little hurdle overcome.
There's quite a few pins wired, at first I was comparing it with the RS232
DB-25 which most pins made sense. I should probably look up the others and
see how they differ and such (I'm clueless when it comes to RS422/485, so
I'll be googlin' tonight).
Jason
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of Jack Hudler
Sent: Wednesday, May 23, 2007 6:54 PM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] Kode 375-928 Display - Help!
It might be RS-485 and so multiple displaies could have its own address on a
multidrop setup.
About the only trick there is finding out if its 2 or 4 wire 485 (probably 2
because of the address).
Think I've seen some USB to 485 converters on the market, but you might get
away with driving it with RS-232.
Go Google RS-485
Hi Jason:
RS-422 and RS-484 are differential systems BUT can be directly connected to
RS-232 equipment. See: http://www.prc68.com/I/Trimpack.shtml#Com and look at
the I/O cable paragraph and table. Pay no attention to the pin letters for the
mil connector and read the footnotes under the table.
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.precisionclock.com
Jason Rabel wrote:
Interesting you would mention that! After my first post I pulled the board
with the connector and was looking at the traces from the DB-25. One of the
chips nearby is a SN75176AP which I found a PDF saying it is a differential
bus transceiver (RS422). I have a SBC that you can set the com port to
RS232/422/485, so that's one little hurdle overcome.
There's quite a few pins wired, at first I was comparing it with the RS232
DB-25 which most pins made sense. I should probably look up the others and
see how they differ and such (I'm clueless when it comes to RS422/485, so
I'll be googlin' tonight).
Jason
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of Jack Hudler
Sent: Wednesday, May 23, 2007 6:54 PM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] Kode 375-928 Display - Help!
It might be RS-485 and so multiple displaies could have its own address on a
multidrop setup.
About the only trick there is finding out if its 2 or 4 wire 485 (probably 2
because of the address).
Think I've seen some USB to 485 converters on the market, but you might get
away with driving it with RS-232.
Go Google RS-485
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Hi Jason,
Going by the age of the unit - Kode bought by Odetics, and Odetics now Zyfer
etc, I'm pretty sure you are dealing with a RS-232 interface. Would be very
surprised if 422. Unfortunately Odetics/Zyfer don't support any of the old
stuff any more, but I'll make an enquiry to one of my old contacts on your
behalf to see if anyone has info.
Rob
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of Jason Rabel
Sent: 24 May 2007 01:11
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] Kode 375-928 Display - Help!
Interesting you would mention that! After my first post I pulled the board
with the connector and was looking at the traces from the DB-25. One of the
chips nearby is a SN75176AP which I found a PDF saying it is a differential
bus transceiver (RS422). I have a SBC that you can set the com port to
RS232/422/485, so that's one little hurdle overcome.
There's quite a few pins wired, at first I was comparing it with the RS232
DB-25 which most pins made sense. I should probably look up the others and
see how they differ and such (I'm clueless when it comes to RS422/485, so
I'll be googlin' tonight).
Jason
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of Jack Hudler
Sent: Wednesday, May 23, 2007 6:54 PM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] Kode 375-928 Display - Help!
It might be RS-485 and so multiple displaies could have its own address on a
multidrop setup.
About the only trick there is finding out if its 2 or 4 wire 485 (probably 2
because of the address).
Think I've seen some USB to 485 converters on the market, but you might get
away with driving it with RS-232.
Go Google RS-485
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