NKT Photonics Koheras ACOUSTIK, Product Manual

Page: 85 / 96

85
C Interface Pin Assignments
Modulation input/output
The Modulation input/output interface on the laser is a male D-sub 9 pin
connector. The pin assignments are described in
Table 11
.
Table 11 Modulation connector pin assignment
External bus
The External bus connector on the rear panel of the laser is a female D-sub 15 pin
connector. The pin assignments are described in
Table 12
.
Table 12 External bus pin assignment
Pin # Signal Description
1 Trigger Logic input/output for either control or indication of laser emission.
Active high. See Trigger for more information.
2 GND 0 volt ground
3 Amplitude- Negative branch of differential input/output for amplitude
modulation.
4 AGND 0 volt analog ground for modulation signals
5 Wavelength- Negative branch of differential input/output for wavelength
modulation.
6 GND 0 volt ground
7 Am Positive branch of differential input/output for amplitude modulation.
8 AGND 0 volt analog ground for modulation signals
10 Wav Positive branch of differential input/output for wavelength
modulation.
Pin # Signal Description
1 NC Not connected
2 RS485- The negative/inverted link of the RS485 communication signal.
3 Interlock loop+ Positive connection of the interlock loop. Must be connected to
Interlock loop- (pin no. 4) to enable laser emission from the system.
4 Interlock loop- Negative connection of the interlock loop. Must be connected to
Interlock loop+ (pin no. 3) to enable laser emission from the system.
5 Emission Collector output with an internal 270 Ω resistor in series.Outputs a
logic high when the Koheras ACOUSTIK system has laser emission
ON. To indicate emission with an LED, its anode can be connected
directly to this pin and its cathode connected to the GND (pins 5,6,
13 or 14).
10 RS485+ The positive/non-inverted link of the RS485 communication signal.
11 Not in use For future use, do not connect anything to this pin.