[GreenKeys] Camiacs RS-232 / CL converter information sheet - v0.1

[drlegendre .]

The Camiacs-made RS-232 / CL converters, while apparently quite prevalent,
seem to be completely un-documented. Multiple attempts at searching up any
kind of literature have proved fruitless.

So, I've undertaken to begin documenting them myself. Here's the first
version (0.1) of my Camiacs Model V datasheet.. I will attach a .txt copy
as well as paste it into the mail.

Your comments - and more importantly, any corrections - are very much
appreciated.

_____________________________________

Camiacs Model V RS-232 - Current Loop converter info-sheet - Ver. 0.1 -
28-DEC-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.)

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
Internal Fuse - 5A / 250V (Buss MDX 5)


II. Internal features
---------------------

A. Fuse information:

Buss MDX 5A / 250V - Bottom of PCB

B. LED information:

LED1 - Tx circuit activity
LED2 - Rx circuit 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) 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 presently not
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.

2) The 6-pos. jumper header near the edge of the board, adjacent to D1 and
D2, is for spare jumper storage.

3) A simple loopback test can be made as follows: On the current loop port,
connect Pins 1&3 with a 470R 1/2W, and Pins 3&4 with a second 470R 1/2W.
Any data sent to the RS-232 port will be echoed back to the sending device.


3) IC 1 is the Tx opto-coupler, IC 2 is the Rx opto-coupler. If IC 1 is
bad, neither LED will flash in loopback. If LED 2 is bad, both LEDs will
flash in loopback, but no characters will be returned to the terminal
screen.
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Camiacs Model V RS-232 - Current Loop converter info-sheet - Ver. 0.1 - 28-DEC-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.)

	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
	Internal Fuse - 5A / 250V (Buss MDX 5)
	 

II. Internal features
---------------------

	A. Fuse information:

	Buss MDX 5A / 250V - Bottom of PCB

	B. LED information:

	LED1 - Tx circuit activity
	LED2 - Rx circuit 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) 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 presently not 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. 

2) The 6-pos. jumper header near the edge of the board, adjacent to D1 and D2, is for spare jumper storage. 

3) A simple loopback test can be made as follows: On the current loop port, connect Pins 1&3 with a 470R 1/2W, and Pins 3&4 with a second 470R 1/2W. Any data sent to the RS-232 port will be echoed back to the sending device.  

3) IC 1 is the Tx opto-coupler, IC 2 is the Rx opto-coupler. If IC 1 is bad, neither LED will flash in loopback. If LED 2 is bad, both LEDs will flash in loopback, but no characters will be returned to the terminal screen.