IMS Version 9

/LOOPTEST

Format

Read syntax diagramSkip visual syntax diagram>>-+-/LOOPTEST-+--LINE--line#--PTERM--pterm#-------------------><
   '-/LOO------'

Environments and Keywords

Table 75 lists the environments (DB/DC, DBCTL, and DCCTL) from which the command and keywords can be issued.

Table 75. Valid Environments for the /LOOPTEST Command and Keywords
Command / Keywords DB/DC DBCTL DCCTL
/LOOPTEST X X
LINE X X
PTERM X X

Usage

/LOOPTEST is a multisegment command that creates an output write loop that tests for output errors. It causes a single-segment message to be repeatedly transmitted to the terminal being tested.

Multisegment input is combined into a single segment for output transmission. For the terminal in looptest mode to receive the complete message, the cumulative output segment must not exceed the terminal's output size restrictions.

/LOOPTEST requires an EOM indication to denote end-of-message; an EOS indication must be included for all segments that precede the last segment. See Multisegment Command Input for more detail on using EOS and EOM.

/LOOPTEST causes all I/O error detection and notification procedures within IMS to be bypassed. Depending on the types of errors involved, some write loops might result in high processor utilization.

The /END command terminates looptest mode.

LINE, PTERM
Specifies the communication line or physical terminal to be placed into looptest mode. If the terminal in looptest mode is attached to a multipoint line, the entire line must be stopped and idle before the /LOOPTEST command is allowed. /LOOPTEST is not allowed on VTAM-attached terminals, switched lines, or lines for System/3 and System/7.

If the device specified is not powered on and ready, intervention-required messages will be sent to the master terminal.

The /DISPLAY LINE PTERM command identifies a terminal in looptest mode.

Example for /LOOPTEST Command

Entry ET:

  /LOOPTEST LINE 5 PTERM 1 (EOS)
  DATA TEST (EOS)
  12345 (EOM)

Response ET:

  DFS058I  LOOPTEST COMMAND COMPLETED

Response RT:

  DATA TEST 12345
  DATA TEST 12345
  and so forth.

Explanation: DATA TEST 12345 is repetitively sent to PTERM 1 on LINE 5.

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Copyright: IBM Corporation 1974, 2004 Copyright IBM Corporation 1974, 2004  timestamp Last updated: March, 2004