Procedure for installing multiple data set support with Download for z/OS

Use this procedure to install the Download for z/OS multiple data set support:
  1. Install the Download for z/OS user exit 15 program, apsux15m, on MVS. The program must be assembled and linked into a data set referenced in the STEPLIB of your Download for z/OS startup PROC.
  2. Run Download for z/OS on MVS using SEND_REC_LENGTH=YES either by specifying it explicitly in the Download for z/OS Routing Control data set on MVS or by allowing it to default. If you specify SEND_REC_LENGTH=NO, ACIF might be unable to process some variable length line mode data. In these cases ACIF issues a message that it cannot read the input file with a return code of 310.