Connecting accessories with the external bus
80
Figure 49 Collimator Installed in a Holder Receptacle
Caution: NKT Photonics recommends to ensure there is firm thermal contact be-
tween the collimator and its surroundings. If the thermal contact between the col-
limator and its surroundings is poor, the collimator can become significantly
warmer than its surroundings. This is due to a small fraction of beam power (stray
light) being absorbed within the collimator.
Connecting accessories with the external bus
External bus The External Bus port is a digital bus interface and 12 volt supply for attached
accessories. The accessories used with the laser are connected to CONTROL
through the external bus and the laser. The bus data signals are based on a
subset of the RS-485 protocol. The bus is also made up of other signal lines,
including a logic output pin representing laser emission and an extension of the
laser’s interlock circuit.
Connecting the
external bus
If no accessories are used with the laser, place the supplied bus defeater onto
the laser’s External Bus port. If accessories are used, connect the accessories to
the External Bus port in a daisy chain configuration using the supplied External
Bus cable(s). The last accessory connected to the daisy chain must have the bus
defeater placed onto its output bus.
Bus defeater
A bus defeater is a DB-15 connector with it’s interlock circuit pins looped back. A
bus defeater is included with the laser. If you need a replacement, contact NKT
Photonics support – see “Support contact details” on page 94.
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