24
Synrad Firestar OEM v30 reference guide
Technical reference (cont.)
Interface B connector (RJ45)
The RJ45 8-8 Interface B connector provides a +15 VDC auxiliary output (DC Out), two inputs, and three status outputs
(Table 6). Two user inputs, Laser Enable and PWM Positive, enable lasing and provide output power control.
Apply a +5 V signal to the Laser Enable input to enable lasing (after a five-second delay). Control power by connecting a
PWM Command signal (+5 VDC, 5 kHz nominal) between PWM Positive and PWM Negative (or GND) inputs. The OEM
v30 does not generate a tickle signal so customers must provide a 5 kHz, 1 µs tickle pulse between applied PWM signals.
Note: You must send a Laser Enable signal to Pin 7 before applying a PWM Command signal. Configure your control
system to provide a Laser Enable signal only after all other safe operating conditions are met.
On the RJ45 connector, three 5V logic level outputs are available to communicate laser status to the control system. Laser
Ok is high when lasing is possible; the output goes low when a fault is detected. Voltage Ok is high when the DC supply
voltage is within limits; low after sensing an under/over voltage condition. Temperature Ok is high when laser temperature is
within limits; low if laser temperature rises above its thermal limit.
Note: When switching +5 VDC to the Laser Enable input (RJ45, Pin 7) through a switch or relay contact, we highly
recommend adding a 100 Ohm, 1/4 watt resistor in series between the switching device and the Laser Enable input.
Table 6 Interface B (RJ45 8-8) pinouts
Pin Name Function
1 PWM Positive Optoisolated input for PWM/tickle signals. Reference to PWM Negative (Pin 6) or GND (Pin 8).
2 DC Out Pin 2 provides a +15 VDC, 250 mA maximum, user output voltage.
3 Laser Ok Logic output high when no faults detected; low if laser fault. The Laser Ok output sources 20 mA
typical, 40 mA maximum.
4 Temperature Ok Logic output high when temperature within limits; low if over temperature condition detected. The
Temperature Ok output sources 20 mA typical, 40 mA maximum.
5 Voltage Ok Logic output high when DC supply voltage within limits; low if DC input is under/over voltage. The
Voltage Ok output sources 20 mA typical, 40 mA maximum.
6 PWM Negative Negative side of optoisolated PWM Command signal. Reference Pin 6 to PWM Positive (Pin 1) or
GND (Pin 8). If this input does not provide a PWM return, it must be connected to GND (Pin 8).
The control board will be damaged if this pin is left unconnected.
7 Laser Enable Logic input. Enables laser control when high; disables laser when low. A five-second delay is invoked
after this pin goes high. Laser Enable must be high before PWM Positive can fire the laser.
8 GND Ground (return) pin for RJ45 input/output signals.
Caution
possible
equipment
damage
The Interface B (RJ45) Laser Enable input is a direct 5V logic input. Do not send
a voltage signal to the Laser Enable input (Pin 7) until DC power is applied—the
control board will be damaged. Observe all 5V logic specifications and precau-
tions when integrating Firestar OEM v30 inputs and outputs into your control
system.
PWM Negative (Pin 6) must be connected to GND (Pin 8) or it must serve as the
return path for the PWM Positive signal.
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