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INTERFACE CONNECTIONS PAGE | 53
Table 3-3 Interface A (DB-9) pin descriptions
Important Note: When swi5 VDC to the Laser Enable input on Pin 9 through a switch or
relay contact, we highly recommend adding a 100 Ohm, 1/4-watt resister in series between the
switching device and the Laser Enable input.
Pin Description Function
1
PWM Positive
Input
Use this optoisolated voltage input for tickle and PWM signals referenced
to PWM Negative (Pin 6). The tickle signal is a +5 VDC, 1
μ
s pulse at 5 kHz
while the PWM Command signal is a +5 VDC, 5 kHz nominal (100 kHz
max) pulse width modulated square wave.
2
Laser Ready
output
This output is logic high (+5 V) when the laser is ready to lase (RDY
indicator illuminated yellow). The output is low (0 V) when the laser is
disabled (RDY indicator Off). The Laser Ready output sources 20 mA
typical, 40 mA maximum.
3
Lase Indicator
output
This output is logic high (+5 V) when the laser is actively lasing (LASE
indicator illuminated red). The output is low (0 V) when the laser is not
lasing (LASE indicator Off). The Lase Indicator output sources 20 mA
typical, 40 mA maximum.
4 Over temp
Fault output
This output is logic high (+5 V) when an over temperature fault condition
is detected (RDY indicator flashing continuously). The output is low (0 V)
when laser temperature is within normal limits. The Overtemp Fault output
sources 20 mA typical, 40 mA maximum.
5 DC Out output
This connection provides a +5 VDC, 250 mA maximum user output
voltage referenced to GND (Pin 8). For example, jumper or switch this
output to drive the Laser Enable input.
6
PWM Negative
input
This input provides the negative, or return, side of the optoisolated
tickle/PWM Command signal referenced to PWM Positive (Pin 1).
7
DC Voltage
Fault output
This output is logic high (+5 V) if the DC input voltage is under or over
voltage limits and the PWR indicator flashes a repeating sequence of 1
blink (under voltage) or 2 blinks (overvoltage). The output is low (0 V)
when DC input voltage is within limits. The DC Voltage Fault output
sources 20 mA typical, 40 mA maximum.
8 GND
This connection is the ground, or return, point for all signals except PWM
Positive.
9
Laser Enable
input
When this input is logic high (+5 V), the laser is enabled (RDY indicator
illuminates yellow). The laser is disabled when the input is low (0 V). Tickle
or PWM signals are applied to the RF circuit immediately after this input
goes high.