Tektronix ECO 422, Instruction Manual

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Operating Basics
ECO 422
2–5
Remote. The rear-panel connector is a 9-pin female D-connector, with one pin
tied to ground (see Figure 2–4). The connector has the following pinout:
Figure 2–4: Remote Connector Pin-Out
The pin assignment is as follows:
Ground-Closure
Pin
Signal Function
1 Auto Switching (Input)
2 Toggle Sync Source (Input)
3 Indicate Primary Sync Source Active (Output)
4 Indicate Backup Sync Source Active (Output)
5 Fault Alarm (Output)
6 Fault Reset
7 Fault Rep
8 Fault Reporting –
9 Ground
Auto Switching (active low) If low, the automatic switching function from the
front panel is disabled. The front panel cannot override this remote command.
Toggle Sync Source (active low) Operates the same as the Sync Source button on
the front panel. A low pulse will cause the ECO 422 to toggle between Primary
and Backup as the output signal.
Indicate Primary Sync Source Active (active high) Indicates that the Primary
signals are the sync source.
Indicate Backup Sync Source Active (active high) Indicates that the Backup
signals are the sync source.
Fault Alarm (active high) Indicates that at least one of the Primary or Backup
input signals is “bad.” This alarm signal is latched and will remain high until the
error is cleared and the Reset button is pressed.
Fault Reset (active low) This operates like the front-panel Reset button. It clears
the fault indicators (turns off the LEDs) after the fault has been corrected.