HP 8921A - Changing the Content of a Message Field

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Chapter 6, Call Processing Subsystem
Using the CALL BIT Screen
Changing the Content of a Message Field
Perform the following steps to change the contents of a message field:
1. Position the cursor on the Data Spec field and select Bits.
2. Select the Set Message field. A Choices: menu is displayed listing the available
messages. Select the desired message. The message fields will be displayed on the
screen.
3. Select the desired bit field. A Choices: menu will be displayed. Using the Choic-
es: menu enter the desired bit pattern. Select Done from the Choices: menu when
the desired bit pattern has been entered.
When a message field is being modified the original contents of the field (that is -
the contents of the field before modification was started) is sent whenever the
message is used in a messaging protocol. The new contents are not used until
Done is selected from the Choices: menu. Use the CANCEL key to abort a
modification. If the CANCEL key is selected the original field contents are
restored.
NOTE: If a message field is modified while the Data Spec field is set to Std the modified contents
will be overwritten with the bit patterns generated using the signaling formats defined in the
applicable industry standard immediately after Done is selected from the Choices: menu.