[GreenKeys] RS232 to TTY Loop Boards
drlegendre .
drlegendre at gmail.com
Sun Feb 15 20:22:32 EST 2015
Quick question for those in-the-know..
Is it possible to use one of these Camiacs Model V converters with a Model
15? The Camiacs will source 24VDC @ 55mA, which is certainly enough current
to operate the selector. But is the inductive lag of the mdl. 15 selector
so high that 24V simply won't work fast enough, even on short runs - as in
a few feet, across the room?
I've attached my latest version of the Camiacs document, in case you care
to see it. I wasn't able to find +any+ data for these things, so I had to
come up with some of my own..
it would be nice if these units would work on the Model 15.. then I won't
have to build a new converter just for that purpose.
On Sun, Feb 15, 2015 at 5:22 PM, Ed Sharpe Archivist for SMECC via
GreenKeys <greenkeys at mailman.qth.net> wrote:
> I would like to find something nice and turnkey do not have time to
> mess building it at this time Ed#
>
> In a message dated 2/15/2015 2:03:59 P.M. US Mountain Standard Time,
> lester at veenstras.com writes:
>
> Before I order some, does anyone have any of these boards available,
> populated or un-populated?
> http://www.aetherltd.com/connecting.html
>
> Lester B Veenstra MØYCM K1YCM W8YCM
> lester at veenstras.com
>
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> -----Original Message-----
> From: greenkeys-bounces at mailman.qth.net
> [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of John Nagle
> Sent: Saturday, February 19, 2011 12:14 PM
> To: greenkeys at mailman.qth.net
> Subject: Re: [GreenKeys] RS232 to TTY Loop
>
> > From: Wa3frp<wa3frp at aol.com>
> > Subject: [GreenKeys] RS232 to TTY Loop
> >
> > I was wondering if anyone has a solution for me.
> > I am looking to key my 60 ma teleprinter loop from my laptop using the
> RS-232 interface.
>
> Sure. See
>
> http://www.aetherltd.com/connecting.html
>
> John Nagle
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Camiacs Model V RS-232 - Current Loop converter info-sheet - Ver. 0.3 - 01-JAN-2014
(c) 2014 legendre at nerp.net - This document may be freely redistributed under the terms of the current GNU/GPL license.
Circuit board "RS232/CL MODEL 5 CAM 25-116A"
I. External ports
-----------------
A. RS-232 Port (DB25-F) pinout information:
2 - TXD
3 - RXD
5 - CTS *
6 - DSR *
7 - GND
8 - DCD / RLSD *
1, 4, 9-25 - N/C
(* = Manually set active / inactive with internal jumper. Default = active. See end notes for further information.)
B. Current Loop Port (DB25-F) pinout information:
1 - Rx+
2 - Rx-
3 - Tx+
4 - Tx-
C. AC mains power
Voltage - 117V AC via IEC connector on rear panel
Red LED power indicator on front panel
Utility sockets - Two (2) on rear panel, fused.
Power consumption - 5W (40mA) average, not including utility socket load
II. Internal features
---------------------
A. Fuse information:
Buss MDX 5A / 250V - Bottom of PCB
B. LED information:
LED1 - Tx loop activity
LED2 - Rx loop activity
Note: Apparent LED brightness is proportional to magnitude of loop current & data rate.
Higher current level and/or lower data rate = higher relative brightness.
B. Loop current power supplies (24V / 55mA short-circuit):
Jumper set T1-T9 - Tx loop power
T2-T3, T4-T5, T6-T7 = Tx Active (Default)
T1-T2, T3-T4, T5-T6 = Tx Passive
Jumper set R1-R9 - Rx loop power
R2-R3, R4-R5, R6-R7 = Rx Active
R1-R2, R3-R4, R7-R8 = Rx Passive (Default)
III. Additional Notes
---------------------
1) While this converter is intended for 20mA current loop operation, the DC power supply is configured for 24V DC @ 55mA short-circuit. For short runs, use an appropraite current-limiting resistor in the loop(s) to attenuate current to 20mA nominal. 750R @ 1/2W is suggested for short runs; 470R - 1K should be acceptable.
2) Being that the current loop protocol does not support any form of hardware flow control, as does the RS-232 protocol, the various jumper settings for the CTS, DSR and DCD / RLSD lines are only present to satisfy the requirements of the RS-232 device. They have no bearing on the activity or status of the current loop Rx / Tx lines, where only software flow control (XON / XOFF) may be implemented.
3) A simple loopback test can be made as follows: On the current loop port, connect Pins 1&3 with a 750R 1/2W, and Pins 3&4 with a second 750R 1/2W. Any data sent to the RS-232 port will be echoed back to the sending device. When performing a loopback test, be sure to de-select "Local echo" on the RS-232 side, lest there be any confusion (false positive). However, it is allowable and may be necessary to select "Add linefeed" on the RS-232 side.
4) The 6-pos. jumper header near the edge of the board, adjacent to D1 and D2, is for spare jumper storage only. This header is not connected to the circuitry.
5) IC 1 is the Tx opto-coupler, IC 2 is the Rx opto-coupler.
6) There is a 7-pos. jumper header, fitted with two jumpers, on the edge of the board adjacent to IC 5. The purpose of this header has not presently been discovered, but it appears to select which outputs from the MC1489A are delivered to the rest of the circuitry. The default settings are 2-3 and 6-7, with pin 1 being closest to the rear of the chassis.
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