EEG 491 Series Manual page 41

GPO Pin Assignments
GPI Switch Functions
39
The GPOs use the lower 16-pin connector, which mates to a female IDC-
16 connector. The pin assignments are given in the table below:
Pins
1,2
3,4
5,6
7,8
9,10
11,12
13,14
15,16
Each GPI Switch is activated when closed (connected to ground), and
inactive when open (left floating). The default GPI function mappings are
defined as follows:
GPI-A: Force 608 Up-conversion
Activating this function causes upconverted 608 caption data from the SD
video input to be encoded onto the HD video outputs, even in the presence
of upstream captioning on the HD input. Locally input data will still
override the upstream 608 data, but all upstream VANC caption data will
be ignored.
GPI-B: Modem Lockout
Activating this function disables the dial-up modem for data input. The
modem will still answer calls, but users will not be able to enter caption
data. If a modem user is entering data, and then this switch is closed, the
modem user will be cut off from entering more data
GPI-C: Port 2 Lockout
Activating this function disables P2 for data input. Users connected to P2
will not be able to enter any caption data, and if a user is inputting data
and then the switch is closed, the serial port user will be cut off from
entering more data.
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Output
1
2
3
4
5
6
7
8
HD491 Smart Encoder