technical reference
70
SYNRAD OEM v40 Operator’s Manual Version 4
User I/O connections
Output signals
Firestar’s five user outputs correspond to the status functions described below. Outputs are optoisolated,
bi-directional analog switches that allow for high-side or low-side switching. The shared connection, Out-
put Common, is separate from the laser’s chassis ground to allow for high-side or low-side switching and to
isolate control signals for optimum EMI performance.
Firestar’s optically-isolated outputs are useful for sending laser status to a Programmable Logic Controller
(PLC) or computerized control system. Each of the five outputs can source 50 mA at ±24 VDC maximum
for a total load of 250 mA. For controlling larger loads, use these outputs to drive a control relay.
Note: Firestar
Laser Ready and Shutter Open output signals denote separate control functions within
the laser. Although the Laser Ready output (RDY indicator On) may close while the Shutter
Open output is open (SHT LED Off), no power is applied to the RF boards until both Laser
Ready and Shutter Open outputs are closed (RDY and SHT indicators illuminated).
Pin 6
Laser Active
This bi-directional switched output is internally connected to Pin 13, Output Common, when
the laser is actively lasing (LASE indicator red). This output is open (high impedance) when no
beam is being emitted (LASE indicator Off). Refer to Table 3-5 for output circuit specifications.
Pin 7
Over Temperature
This bi-directional switched output is internally connected to Pin 13, Output Common, when
laser temperature is above safe operating limits (TMP indicator red). The output is open (high
impedance) when laser temperature is within operating limits (TMP indicator green). After an
over temperature fault occurs, cool the laser and then cycle DC power to reset the laser. Refer to
Table 3-5 for output circuit specifications.
Pin 8
Laser Ready
This bi-directional switched output is internally connected to Pin 13, Output Common, when
the laser is enabled (RDY indicator yellow), indicating that lasing will occur when a PWM Com-
mand 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). Refer to Table 3-5 for output circuit specifications.
Pin 13 Output Common
Use this pin to complete the return (ground) path for any output connection (Pin 6, 7, 8, 14, or
15). The Output Common line is protected by a 0.25 A self-resetting fuse.
Pin 14 Shutter Open
This bi-directional switched output is internally connected to Pin 13, Output Common, when a
Shutter Open Request signal is present (SHT indicator blue), indicating that lasing may be en-
abled 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) Refer to the following table for output circuit
specifications.
Pin 15 Interlock Open
This bi-directional switched output is internally connected to Pin 13, Output Common, when
remote interlock circuitry is open (INT indicator red), indicating that lasing is disabled. The out-
put is open (high impedance) when lasing is enabled (INT indicator green). See the following
table for output circuit specifications.
