Quantum Data 881, User Manual

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122 Chapter 14 Using Special Sync Output
• If the probe is within the active portion of the frame, an alternate vertical position
Y:nnnn is also displayed, indicating the number of lines between the start of active
(Y:0) and the leading edge of the probe in the vertical direction.
Controlling the probe using the command line interface
Using the command line interface to control the probe provides more control, enables you
to change the polarity and width, and to change the format and image while maintaining
the probe pulse parameters.
To configure the probe feature:
1. Establish a session with the generator using either HyperTerminal over a serial
connection or Telnet over an Ethernet LAN. See “ Establishing a terminal session with
the 882 ” on page 30 or “ Establishing a Telnet session with the 882 ” on page 33.
2. Enable the probe feature by entering the following commands:
FSPG 0 // disable the frame sync on special sync output
PSPG 1 // enable the probe pulse
PSPP 1 // set the probe pulse polarity (0 for low or 1 for high)
PSPW 10 // set pulse width to 10 pixels (range: 1 pixel to HTOT - 1)
PSHD 100 // set pulse horizontal position at 100 pixels from leading
// edge of horiztonal sync pulse, in range from 0 <=
// PSHD < ( HTOT - PSPW - 1)
PSVW 50 // set the pulse vertical position at 50 lines from leading
// edge of vertical blanking, in range from 0 <=
// PSVD < (VTOT-1)
ALLU // apply the settings
To set the lines on which the probe pulse occurs:
1. Enter the appropriate command:
2. Send the
ALLU
command to apply the setting.
Set the probe pulse to occur Command
Once per frame
PSPM 0
Once every active line
PSPM 1
Once every line
PSPM 3