Black Box A/S-4 manual Appendix B General 3770 SNA Communication Operations

APPENDIX B: General 3770 SNA Communication Operations

8.After the operator has finished working, he should signoff the application. The system will UNBIND all the LUs from the host system so that the work station and application are no longer communicating with each other. This leaves the work station available for an operator to logon to another application. SSCP may send an enter request logon message which puts the work station back to step 4 so as to start things over again.

Batch Terms:

Function Management Header 1 (FMH-1) is used to select a destination within an LU. When sent by the A/S-4 it indicates to the host which device (card reader or console) is sending data to the host, used in the same way when host sends FMH-1 to the A/S-4.

Function Management Header 2 (FMH-2) specifies the data management activities to be performed at the destination selected with the FMH-1. Typical data management activities are adding and replacing records, numbers of copies to print and date data created.

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