The -Event output (pin 13) provides a way to directly monitor the receipt of a triggering event on the TSR PRO/PRO-HB. The TSR PRO/PRO-HB User Manual can be found here. The following table provides pin out descriptions for the TSR DB15F connector.
Use of the Event output lines for trigger indication on the TSR unit requires the presence of a positive voltage (max 36 VDC and/or 30mA) on the +Event output pin (pin 3).
- External Voltage Source: Use a current-limiting resistor in-line to protect the unit.
- Resistor Value = Input Voltage / 30mA
- TSR PRO/PRO-HB +2.7 VDC Reference Voltage: An RC circuit should be placed between +2.7 VDC (pin 9) and Ground (pin 15). See figure below.
When using a switch trigger to issue an external event, a low-current LED indicator (10mA, 1.7V) can be connected between the -Event output (pin 13) pin and Ground (pin 15).
The 75k-Ω resistor value is adjustable based on the current and voltage drop requirements of the LED being used. However, the current going in to the +Event output pin must be limited to 30mA.
How it works:
Whenever a event trigger has been seen -- via either an external or internal source -- current flows through the Event output lines. This current flow will continue for as long as the triggering event signal is present. In the case of an internal trigger, this signal will be momentary and will not be active long enough to view using a visual indicator such as an LED; it can, however, be captured using external means such as an oscilloscope, a digital multimeter (DMM) in diode mode, etc. In the case of an external trigger event, the Event output current flow will be active for however long the Event input signal is active.