technical reference
316
Synrad
Series 48Series 48
Series 48Series 48
Series 48 operator’s manual
Integrating Series 48 safety features
The Integrating Series 48 safety features section includes subsections:
■ Keyswitch functions
■ Remote Interlock functions
The Series 48 DB9 Connector allows system integrators or end-users to integrate Series 48 laser safety
features into their control system. In particular, the Series 48 Remote Keyswitch and Remote Interlock
functions serve to disable DC power to the laser’s RF driver. Without power, the RF driver cannot supply
PWM Command or tickle signals to the resonator, causing the CO
2
gas to remain in a zero-energy state.
Keyswitch functions
Keyswitch lasers
After DC power-up, or after a fault or open interlock condition, the Keyswitch must be toggled to reset
the laser, which enables the PWR LED and signals that DC power is applied to the RF driver. For Key-
switch lasers used in automated control systems, this reset function is provided by the Remote Keyswitch
signal via pins 6 and 7 on the DB9 Connector. To use this “remote keyswitch” functionality, first place
the Keyswitch in the ON position. To reset a fault condition, open and then close a “dry-circuit” (zero
voltage) switch or relay contact between pin 6, Remote Keyswitch Input, and pin 7, Remote Keyswitch
Output. Reconnecting pin 6 to pin 7 applies power to the RF driver and begins a five-second delay after
which lasing is enabled. The RF driver is disabled as long as the remote keyswitch connection is open.
Your control system can monitor the laser’s power-on status through the DB9 Connector by connecting
your system’s input between pin 9, Remote Ready LED Output, and pin 2 or pin 4, Signal Ground. The
Remote Ready LED Output goes active when the laser is enabled (PWR LED turns On), indicating that
lasing is possible after the five-second delay. The output is inactive (PWR LED off) when lasing is
disabled. Refer back to Table 3-4, DB9 pin assignments for specific details.
Important Note: Pin 9, the Remote Ready LED Output, is a current- and voltage-limited output
meant only for direct connection to an LED or LED-input optoisolator.
OEM lasers
On OEM lasers, the PWR LED illuminates on DC power-up and five seconds later DC power is applied
to the RF driver. To reset an OEM fault condition, remove DC power for 30 seconds and then reapply
power to the laser or toggle (open, then close) the Remote Keyswitch signal via pins 6 and 7 on the
DB9 Connector. To use this OEM remote reset functionality, open and then close a “dry-circuit” (zero
voltage) switch or relay contact between pin 6, Remote Keyswitch Input, and pin 7, Remote Keyswitch
Output. Reconnecting pin 6 to pin 7 applies power to the RF driver and begins a five-second delay after
which lasing is enabled.
Your control system can monitor the laser’s power-on status through the DB9 Connector by connecting
your system’s input between pin 9, Remote Ready LED Output, and pin 2 or pin 4, Signal Ground. The
Remote Ready LED Output goes active when the laser is enabled (PWR LED turns On), indicating that
lasing is possible after the five-second delay. The output is inactive (PWR LED off) when lasing is dis-
abled. Refer back to Table 3-4, DB9 pin assignments for specific details.
Important Note: Pin 9, the Remote Ready LED Output, is a current- and voltage-limited output
meant only for direct connection to an LED or LED-input optoisolator.
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