technical reference
311Synrad Firestar ti-Series operator’s manual
User I/O connections
Pin Function Description
8 Laser Ready
This bi-directional switched output is internally connected to Pin 13, Output Common,
when the laser is enabled (RDY indicator illuminated yellow), indicating that lasing will
occur when a PWM Command signal is applied to Pin 9 and Pin 1. When this output is
initially switched closed, there is a five-second delay during which lasing is inhibited. This
output is open (high impedance) when the laser is disabled (RDY indicator Off).
9 PWM Input
Connect your PWM Command signal (+5 VDC, 5 kHz nominal, 25 kHz max, pulse width
modulated) to this input pin to control laser output power. Refer back to Controlling laser
power for further information on laser control signals.
10 Shutter Open Request
Apply a positive or negative voltage (±5–24 VDC) with respect to Pin 11, Input Com-
mon to enable lasing. If your system does not supply a Shutter Open Request signal, this
pin must be connected to a voltage source in the range of ±5–24 VDC. Refer to Figure 3-8
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 five-second delay during which lasing is
inhibited.
11 Input Common
Use this input pin to connect return lines for Remote Interlock, Shutter Open Request,
and Remote Reset/Start Request lines.
12 Auxiliary DC Power Ground
This connection provides a ground (earth) connection for +5 and +24 VDC auxiliary
power outputs. This pin is the only User I/O pin that is connected to chassis ground. Do not
use this pin for grounding if DC power to external I/O circuits is supplied from an external
customer-supplied DC power source.
13 Output Common
Use this pin to complete the return path for output connections (Pin 6, 7, 8, 14, or 15).
The Output Common line is protected by a 0.25 A self-resetting fuse.
14 Shutter Open
This bi-directional switched output is internally connected to Pin 13, Output Common,
when the Shutter Switch is Open and a Shutter Open Request signal is present (SHT indi-
cator illuminated blue), indicating that lasing may be enabled if other operating conditions
are met. When this output is initially switched closed, there is a five-second delay during
which lasing is inhibited. This output is open (high impedance) when the laser is disabled
(SHT indicator Off).
15 Interlock Open
This bi-directional switched output is internally connected to Pin 13, Output Common,
when remote interlock circuitry is open (INT indicator illuminated red), indicating that
lasing is disabled. The output is open (high impedance) when lasing is enabled (INT indi-
cator green).
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