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Connecting modulation signals
Table 12 Wavelength modulation pin descriptions
Emission indicator LED
The emission indicator LED turns ON red when the laser emission is enabled.
Power indicator LED
The power LED turns ON green when a 12 volt DC supply is connected to the
module.
Interbus
Connects to the USB-RS-485 adapter over a ribbon cable to control the laser
directly from a PC. The connector additionally carries interlock, enable and
power signals from and to the RS-485 adapter. See “Connecting the laser to a PC
with CONTROL” on page 48.
2-Pin Screw Terminal
Connect a 12 VDC power supply to these two screw terminals to operate the
module in stand-alone mode.
To obtain laser emission automatically when power is connected to the laser, the
Interlock and Enable pins must be pulled-up (see Extra I/O) and the Auto-start
control bit must be set (see Auto-Start for details).
Extra I/O
This 6-pin IDC connector provides miscellaneous connections. These can be
used for example, for pull-up of Enable and Interlock signals when the module is
installed without the Interbus interface.
Table 13 Extra I/O pin descriptions
Pin Name Description
1 Wavelength+ Positive branch of differential input/output for wavelength modulation.
2 AGND Analog ground for wavelength modulation signals
3 Wavelength- Negative branch of differential input/output for wavelength modulation.
Pin Name Description
1 Trigger Logic input/output. Requires external pull-up resistor when used as an
output.
2 GND 0 volt / ground
3 12V 12 V – the interface board contains a 10 kΩ resistor in series with pin B7.
4 Enable This logic input is set high to enable laser emission. When emission is
enabled and this pin is set low, emission is shut off.
A 10 kΩ resistor on the Interface board pulls the Enable pin of the Extra I/O
connector to 12V. Place a jumper across pins 3 and 4 to pull Enable high if
the module is used without an Interbus interface.
5 12V 12 volts – the Interface board contains a 10kΩ resistor in series with pin B8.
6 Interlock This logic input is set high to enable emission. laser emission. When
emission is enabled and this pin is set low, emission is shut off. This input
is for personal safety, and includes redundancy inside the module.
A 10 kΩ resistor on the Interface board pulls the Interlock pin of the Extra I/
O connector to 12V. Place a jumper across pin 5 and pin 6 to pull Interlock
high if the module is used without the Interbus interface.
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