technical reference
3
11
Synrad
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).
