technical reference
315
Synrad
Series 48Series 48
Series 48Series 48
Series 48 operator’s manual
DB9 connections
Table 3-4 DB9 pin assignments
Pin # Signal Name Description / Purpose
1 Fault Shutdown Indicates failure of internal control/RF circuitry or existence of overtemper-
Output ature (> 60 °C ±2 °C), overvoltage, or undervoltage fault. This active low
signal (in reference to pin 2 or pin 4) transitions from +15 V to 0 VDC
when a fault occurs. Provides user with control signal to disable external
systems in the event of a fault. See Note 1.
2 Signal Ground Signal/chassis ground for pins 1, 3, 5, 8, and 9.
3 Remote Interlock Disables laser when opened by a remote door or housing safety interlock. As
Connection shipped, pins 3 and 4 are jumpered to disable the Remote Interlock function.
Allows an open external interlock switch to shut down the laser. Ground
pin 3 only; do not apply voltage to this pin. See Note 2. This feature is
internally bypassed on OEM models.
4 Signal Ground Signal/chassis ground for pins 1, 3, 5, 8, and 9.
5 Message Output Message Output goes low (in reference to pin 2 or pin 4) when laser tube
temperature reaches 54 °C ±2 °C and remains low until temperature falls
2 °C. Provides user with a pre-shutdown temperature warning. Does not
shut down the laser. See Note 1.
6 Remote For connecting a remote relay or switch in series with the laser Keyswitch.
Keyswitch Input Allows user to control laser on/off /reset from a remote location. Connect
pin 6 to pin 7 to run; open this circuit to stop or reset faults. As shipped,
pins 6 and 7 are jumpered to disable the Remote Keyswitch function.
See Note 2 and Note 3.
7 Remote See pin 6 description above. Pin 7 is at DC line potential (+30 VDC) when
Keyswitch the Keyswitch is on or bypassed. Allows user to control laser on/off /reset
Output functions from a remote location. See Note 3 and Note 4.
8 Remote Lase Current and voltage limited output for direct connection to LED or LED-
LED Output input optoisolator. Allows user to connect a remote LASE LED indicator.
See Note 5.
9 Remote Ready Current and voltage limited output for direct connection to LED or LED-
LED Output input optoisolator. Allows user to connect a remote Ready (PWR) LED
indicator. See Note 5.
1 Allen-Bradley (A-B) compatible outputs (pins 1 and 5) are Active Low.
Specifications: OFF: +15 VDC, 5 mA into 3 kOhm. ON: < 1 VDC, sinking 100 mA.
2 “Dry-circuit” (zero voltage) external switches are required since current into remote interlock and debounced
remote keyswitch pins is negligible.
3 Connecting an LED to pins 6 or 7 to indicate keyswitch status requires an external current-limiting resistor.
4 The remote keyswitch output pin is not current-limited or fused.
5 Pins 8 and 9 can be directly connected to the anodes of LEDs or LED-input optoisolators without external
current limiting devices. Connect LED cathodes to pin 2 or 4. Current is limited internally to 20 mA at
3.3 V maximum.
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