LaserSpeed 8000-3 Instruction Handbook

Interfacing with the LS8000-3

User Scaleable Pulse Output (Pins 15, 4, 6, 8)

This pulse output is a user-defined 5-24V voltage output with output rates up to 250 kHz. The output voltage is derived from the User VIN input. The pulse outputs are opto-isolated signals with a voltage level determined by the voltage supplied on Pin 20 (referenced to User-Ground (pin 11, 19, or 21.) An isolated TTL level signal (3.7-5V) will be supplied if no external voltage is connected. The output drivers can handle from 5 to 24 VDC. The external supply requirements are 5–24 volts DC at 300 mA.

The Low Speed Pulse Output can be reconfigured to output several different status outputs using the Low Speed Pulse Output Configuration setting. See the Configuration Settings section for details.

Differential vs. Single Ended Pulse Outputs

The LS8000-3 Pulse Outputs are available as both differential and single- ended outputs. Using a counter with differential inputs will provide the best noise immunity, so Beta LaserMike recommends that the outputs are used in this configuration.

Unfortunately, many counters do not have differential inputs. The pulse outputs can be used as single ended inputs by connecting Phase A True and Phase B True to the counter inputs, and connecting the counter ground to User Ground (pins 11, 19, 21). Leave the Phase A False and Phase B False outputs unconnected when connecting for single ended output. If extra counts occur when the line is not moving, or when the LS8000-3 is powered down, then noise is getting into the cable and triggering the counter. In this case, using a conversion circuit to convert from differential to single ended outputs may correct the problem.

Part No. 93463 / Drawing No. 0921-01561

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Revision A (Sep 2007)

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Laser LS8000-3 manual User Scaleable Pulse Output Pins 15, 4, 6, Differential vs. Single Ended Pulse Outputs