1.3 The SR470 Rear Panel
1 – 21
Figure 1.4: Shutter connector pinout, as seen looking into the con-
nector on the rear panel.
Connector Pin
Description
1
+
12 V to shutter head (Coil power supply)
2
Ground
3
TX (Serial to shutter head)
4
RX (Serial from shutter head)
5
+
4.5 V to shutter head (Logic power supply)
6
Control signal to shutter head (logic level)
Table 1.1: Shutter connector pinouts
The pinout for the connector is shown in Fig. 1.4 and the signal names
are shown in Table 1.1.
The shield of the shutter connector is connected to earth ground as
it ships from the factory. Please see
§
1.3.9 about grounding consid-
erations for more information.
1.3.5
Aux I/O ports
The two rear-panel Auxiliary I
/
O BNC connector (labeled “Aux I
/
O 1”
and “Aux I
/
O 2”) are multifunction I
/
O ports that can be configured
over any remote interface. Each has specific capabilities; please see
§
2.5.3 in the remote programming section for more information.
Both ports can be used for manual TTL-level input or output, and
there are additional capabilities that include inhibiting triggers, forc-
ing a shutter to the normal state, or outputting a pulse when a trigger
is issued. The factory default setting for each is to be configured for
manual control, with high output.
The Aux I
/
O ports are each internally pulled up to
+
5 VDC through
a 10 k
Ω
resistor.
Note: The shields of these BNC connectors are connected to earth
ground.
SR470 Shutter Controller
