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Theory of Operation
External Connectors
GPIO Connector
The GPIO port is a TTL Input/Output port which is used to control
accessories like the pumps.
If no other accessory is used, the GPIO port can be used to trigger a
measurement from an external device. The trigger lines use the GPIO
connector pins as shown in Table 13.
Table 12 GPIO Connector
Pin Function Pin Function
1 Out bit 0 9 In bit 0
2 Out bit 1 10 In bit 1
3 Out bit 2 11 In bit 2
4 Out bit 3 12 In bit 3
5 Out bit 4 13 In bit 4
6 Out bit 5 14 In bit 5
7 Out bit 6 15 DGND
8 Out bit 7
Table 13 Trigger Inputs
Pin Function
9 Trigger blank measurement
10 Trigger sample measurement
11 Trigger standard measurement
12 Trigger stop
13 Trigger kinetics measurement
15 Ground
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