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244 Chapter 8 Working with Test Sequences
Creating a test sequence
You create test sequences using the command line interface. Test sequences consist of
multiple steps. Each step specifies the format and image to display, as well as the duration
of the step. You can create multiple sequence files, which are stored in the generator’s
flash memory.
Creating a test sequence using the command line interface
You can develop test sequences using the command line interface, either by entering
commands interactively through a terminal session or by entering a series of commands in
a text file and then sending the file to the generator through a terminal emulation program
such as HyperTerminal. When developing long test sequences, the recommended
procedure is to enter commands in a text file, and then send the file to the generator. This
approach enables you to change the test sequence without entering the entire command
script.
It is important to note that for digital formats you will need to create separate formats using
the format editor to ensure that the digital video signal type (DVST) is set properly. When a
format is loaded during a test sequence its video type defaults to analog. So if you want to
create for example a test sequence for HDMI for testing high definition televisions you will
need to create the HDMI version of the format setting DVST appropriately. Examples are
provided below.
Use the following procedure to create a test sequence and save it to the sequence
directory on the generator.
To create and save an analog test sequence interactively using the command line
interface:
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. Set the sequence path to the sequence directory in the generator’s flash memory or on
the PC card. For example, to set the path to the generator’s flash memory, enter the
following command:
SEQP /tffs0/Library/Sequence
To set the sequence path to the PC card, enter the following command:
SEQP /card0/Library/Sequence
3. Enter the following commands to create a three-step sequence named MySeq .
SEQN // initializes the sequence edit buffer
SEQB // begins a sequence editing session
STEP 1 // selects a step to be edited
SDLY 5.0 // sets the delay for the current step to five seconds