FM Profile 4
Function management (FM) Profile 4 is supported on primary logical unit-secondary logical unit (PLU-SLU) sessions using LU types 0 or 1. This profile uses the following session rules:
PLU and SLU use immediate response mode.
PLU and SLU support the following data flow control (DFC) commands (an asterisk [*] indicates commands permitted by the FM profile that are never sent by Host Integration Server):
CANCEL
SIGNAL
LUSTAT
QEC
QC
RELQ
CHASE*
SHUTD
SHUTC
RSHUTD*
BID and RTR (allowed only if brackets are used)
Length-checked compression allowed
The following FM Usage fields define the options for Profile 4:
Chaining use (PLU and SLU)
Request control mode selection (PLU and SLU)
Chain response protocol (PLU and SLU)
FMH-1 SCB (String Control Byte) Compression indicator (PLU and SLU)
Send EB indicator (PLU and SLU)
FM header usage
Brackets usage and reset state
Bracket termination rule
Alternate Code Set Allowed indicator
Normal-flow send/receive mode
Recovery responsibility
Contention winner/loser
Half-duplex flip-flop reset states