technical reference
44
SYNRAD OEM v30 Operator’s Manual Version 2
Interface connections
Table 4-3 Interface A (DB-9) pin descriptions
Pin Function Description
1 PWM Positive input
Use this optoisolated voltage input for tickle and PWM signals referenced to PWM Nega-
tive (Pin 6). The tickle signal is a +5 VDC, 1 µs 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 O ). 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 illumi-
nated red). The output is low (0 V) when the laser is not lasing (LASE indicator O). The
Lase Indicator output sources 20 mA typical, 40 mA maximum.
4 Overtemp Fault output
This output is logic high (+5 V) when an over temperature fault condition is detected (RDY
indicator ashing 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 ashes a repeating sequence of 1 blink (under voltage) or 2 blinks (over-
voltage). 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 yel-
low). 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.
Important Note: When switching +5 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.
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