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Installation
1780R-Series Service Manual
2–9
The rear-panel REMOTE connector is a subminiature 15-pin D-type receptacle
with female contacts. All the active remote control lines can be forced low by
remote ground closures or TTL levels.
Pin assignments for the REMOTE connector are shown in Figure 2–4.
Figure 2–4: Remote connector and the function of each pin. A / before a function
indicates a low to activate
The 1780R-Series REMOTE connector provides access to several operating
modes plus the first eight Preset front panels which can also be accessed through
the front-panel PRESET selection and touch screen menus.
Table 2–2 describes the remote functions that may be selected. A logic NOT, or
low, means that the specified REMOTE pin must be low (0 V to +0.8 V) to
achieve that function. A high means that the pin is left open (with no signal), or
accepts a 2 V to 5 V signal, to achieve the desired function.
Remote Sync input (pin 10) works with TTL level square waves, and requires an
input signal of approximately 30–60 Hz (NTSC) or 25–50 Hz (PAL) to
synchronize the 1780R-Series. Polarity is internal jumper selected as shown in
Table 2–3.
Forcing pin 2 of the REMOTE connector low disables normal sweep and
connects the RGB staircase signal (input on pin 1) to the horizontal Mag
Amplifier. A +10 V staircase input will deflect the trace approximately 9
graticule divisions. Sweep length, per line or field, is approximately 33% of
normal for an RGB parade display and 25% of normal for a YRGB parade
display. See Table 2–3 (J585) for display selection information.
REMOTE Connector
Remote Operation