technical reference
314
Synrad Firestar f-Series operator’s manual
User I/O connections
Auxiliary DC power
Firestar’s User I/O connector provides auxiliary DC power for driving external inputs or outputs connected
to the User I/O port. Pin 4, +5 VDC Auxiliary Power, and Pin 5, +24 VDC Auxiliary Power, are protected
by self-resetting fuses rated at 0.5 A. Pin 12, Auxiliary DC Power Ground, is connected to chassis ground
while all other User I/O pins are oating with respect to chassis ground. Figure 3-6 illustrates Firestar’s
internal DC supply wiring.
Figure 3-6 Auxiliary power supply wiring
Pin 4 + 5 VDC Auxiliary Power
This connection provides +5 VDC for driving external inputs or outputs. The +5 VDC Auxiliary
Power output can source up to 0.5 A and is protected by a 0.5 A self-resetting fuse. The return
(ground) path must be through Pin 12, Auxiliary DC Power Ground.
Pin 5 + 24 VDC Auxiliary Power
This connection provides +24 VDC for driving external inputs or outputs. The +24 VDC Aux-
iliary Power output can source up to 0.5 A and is protected by a 0.5 A self-resetting fuse. The
return (ground) path must be through Pin 12, Auxiliary DC Power Ground.
Pin 12 Auxiliary DC Power Ground
This connection provides a ground (earth) connection for +5 and +24 VDC auxiliary power out-
puts. This pin is the only User I/O pin that is connected to the laser’s chassis ground. Do not use
this pin for grounding if I/O circuits are powered from an external customer-supplied DC power
source.
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