Coherent C series CO2 laser

This came from a Markem Imaje 7031 laser marking system. Seems there is not much info online, so as I have a working system I thought I'd document it

It is a RF-excited aircooled unit. Label says 150W max, but I have no idea of what the actual output is. Certainly burns well though! Looking at similar units I think it's around 30W.



Unit had 5 fans, presumably 48v as they connected across the input supply. not sure if these are original Coherent or added by Markem

RJ45 In/Out  
1 (orange/white) Input Gate - beam modulation - high for on, low for off. 1-15KHz in original system
2 Power out +15v output
3 Output Goes high after warmup period ( approx 40 seconds)
4   Connected but function unknown
5   Connected but function unknown
6   Connected but function unknown
7 Enable High to enable laser
8   Ground

The header next to the power input has some RS232 signals - outputs a copyright message at startup , 9600 baud
I subsequently found some info in This manual which seems to match up with what I found.

 
1 Modulation
TTL logic input; 1=RF ON, 0=RF OFF; 1 kΩ impedance
This input turns on the laser. See also Pin 7, Control Enable, below
2 + 15 VDC ± 0.5 VDC, 0.25 Amps Max output for customer use
3 LASER OK
TTL logic output; 1=LASER OK, 0=LASER Fault; IOH = -0.4 mA, IOL= 8 mA
Output is asserted when no faults (VSWR, Temp. or Volt.) are detected
4 Temperature OK
TTL logic output; 1=Temp OK, 0=Temp Fault; I OH = -0.4 mA, IOL= 8 mA
Output is asserted when temperature is below the 60ºC case temperature warning level
The temperature fault will occur at a case temperature of approximately 80º
5 Voltage OK
TTL logic output; 1=Voltage OK, 0=Voltage Fault; IOH = -0.4 mA, IOL= 8 mA
Output is asserted when DC supply voltage (V DD ) is between 43 VDC < V DD < 55VDC
6 Temperature Monitor
TTL logic output. This pin puts out a pulse width modulated signal that represents the internal laser
temperature in degrees Celsius. The positive duty cycle of the signal directly represents the
temperature. For example, a duty cycle of 35% represents 35ºC. A duty cycle of 0% represents a
temperature of 0ºC or below, and a duty cycle of 100% represents a temperature of 100º C or
above
7 Control Enable
TTL logic input; 1=Laser Control Enabled, 0=Laser Control Disabled
This input must be asserted before Modulation can be used to turn on laser
8 Customer Logic Ground for all interface signals