technical reference
68
SYNRAD OEM v40 Operator’s Manual Version 4
User I/O connections
Pin 10 Shutter Open Request
Apply a positive or negative voltage (±5–24 VDC) with respect to Pin 11, Input Common, to en-
able lasing. If your system does not supply a Shutter Open Request signal, this pin must be con-
nected to a voltage source in the range of ±5–24 VDC. Refer to the gure below for a diagram
showing how the Shutter Open Request input is factory-jumpered. When a voltage is initially
applied to this input, there is a ve-second delay during which lasing is inhibited. Because all
DC power is removed from the laser’s RF board when this input is inactive, no lasing can occur
until voltage is applied to Pin 10. See the following table for input circuit specications.
Note: To ensure optimum laser performance, there is a ve-second delay imposed from the time
a Shutter Open Request occurs to the time that PWM Command signals are accepted.
Pin 11 Input Common
Use this pin to connect return lines for Remote Interlock, Shutter Open Request, and Remote
Reset/Start Request lines. Refer to the following table for input circuit specications.
Figure below illustrates how Remote Interlock and Shutter Open Request inputs are factory-jumpered
on the Quick Start Plug to enable lasing for initial testing and troubleshooting purposes.
Figure 4-7 Quick Start Plug wiring diagram
The gure on the following page illustrates the input circuit’s equivalent internal schematic while Table
3-4 provides Firestar v40 input circuit specications.
Pin 1 PWM Return
Pin 9 PWM Input
Pin 3 Remote Interlock
Pin 4 +5 VDC
Pin 10 Shutter Open Request
Pin 11 Input Common
Pin 12 Aux. DC Power Ground
Pin 8 Pin 1
PWM Input BNC
of Male DB15
"Quick Start"
Shorting Plug
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