technical reference
323Synrad Firestar ti-Series operator’s manual
DB-9 connections
(SA models only)
The DB-9 connections section includes subsections:
■ DB-9 pin descriptions
■ 48 VDC fan speed control
■ Isolated cooling fan connections
DB-9 pin descriptions
The side-mounted DB-9 connector on SA model lasers provides a Shutter Switch input, auxiliary +5 V
power, and +48 VDC for powering user-supplied 48 V cooling fans. Figure 3-18 illustrates DB-9 pinouts
and Table 3-6 describes the function of each pin on the DB-9 connector.
Important Note: The pinout and functionality of the side-mounted DB-9 connector on ti-Series SA
model lasers is not the same as the connector on t-Series or t70i SA model lasers.
Figure 3-18 DB-9 connector pinouts
Table 3-6 Side-mounted DB-9 pin descriptions
Pin Function Description
1 No Connection
2 Shutter Switch
In Keyswitch models, this input connects to the physical Shutter Switch. Leave this input open to
enable lasing. Grounding this pin indicates that the shutter is Closed, which disables lasing. If
connecting an external shutter switch to Pin 2, the circuit path must be grounded to Pin 6 or Pin
7, Signal Ground. There is a five-second delay imposed from the time the shutter input is opened
to the time that PWM Command signals are accepted.
3 +5 VDC Auxiliary Power
This output provides +5 V for driving external inputs or outputs (like a diode pointer). The
+5 VDC Auxiliary Power output (Pin 3) is protected by a 0.5 A self-resetting fuse. The return
(ground) path is through Pin 6 or Pin 7, Signal Ground.
4 Fan Power, +48 VDC
This output provides +48 VDC for powering a customer-supplied cooling fan. The Fan Power,
+48 VDC output (Pin 4) is sourced directly from the user’s 48 VDC power supply and is protected
by a 1.1 A self-resetting fuse. Pin 4 and Pin 8 can only source a combined current of 1.0 A total.
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