Tektronix SPG8000A Installation And Safety Instructions page 41

This is a 15 pin, D-sub connector that carries four differential LTC signals, two ground closure outputs, and three inputs. The
inputs can be configured as three preset inputs, or as two preset inputs and one general input. You can use the LTC button menu
to independently set the format and timing of the four LTC signals. You can use the SYSTEM : GPI menu to configure the
function of the ground closure input and outputs.
You can configure LTC1 to be an LTC input instead of an output. The supported LTC signal formats include 23.98, 24, 25,
29.97 drop frame, and 30 Hz, as per SMPTE 12M.
The Option XLR breakout cable provides access to most of the signals on the GPI/LTC connector, with the only exceptions being
the preset inputs on pins 4 and 11. When using a standard RGBHV VGA-to-BNC breakout cable, the available signals are as
shown below. See Table 9: GPI/LTC port – connector pin assignments
NOTE. You do not need the optional LTC and GPI breakout cable if you are using only VITC and/or ATC as a timecode signal.
For correct operation if you use a VGA-to-BNC breakout cable, pins 6, 7, 8 and 10 must be internally grounded together in the
cable and to the connector shell.
Do not use VGA cables which ground unused pins because that may disrupt operation of the GPI/LTC port.
Table 9: GPI/LTC port – connector pin assignments
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
SPG8000A Installation and Safety Instructions
Function
GPI out 1
GPI out 2
GPI input / Preset select 3
Preset select 1
LTC 4 negative
Ground
LTC 3 negative
LTC 2 negative
Ground
LTC 1 negative
Preset select 2
LTC 3 positive
LTC 2 positive
LTC 1 positive
LTC 4 positive
on page 23.
VGA cable
Red BNC
Green BNC
Blue BNC
Ground
Ground
Ground
Ground
H BNC
V BNC
Controls and connections
23