User`s guide

6: BSC 2780/3780 Link Configuration Options
DC 900-1340I 177
If this option is set to reverse, the BSC 2780/3780 software automatically turns the line
around by sending EOT after it transmits the last block of each message.
If this option is set to hold, the BSC 2780/3780 software holds the line and continues
sending messages as long as the software has more messages queued for transmission.
The BSC 2780/3780 software turns the line around by sending EOT as soon as it sends
the ETX block of the last queued message.
If this option is set to permanent hold, the BSC 2780/3780 software always holds the line
by sending TTDs. The client must turn the line around by sending a Send EOT
(Section 5.4.1.8 on page 125) or Send Disconnect (DLE EOT) command
(Section 5.4.1.9 on page 125). The remote station cannot transmit until the client turns
the line around.
If this option is set to permanent hold with notify, BSC 2780/3780 operates the same as
the permanent hold option, but a message is sent to the client if an EOT is sent or
received.
Note
Under all option settings, the remote station can force a line turn-
around by responding to a text block with RVI instead of ACK.
To set this option using the DLI configuration file, use the eomLineCtrl parameter; for
example,
eomLineCtrl = “reverse”. See Table 7–2 on page 191.
6.21 Read Session Option (23)
The read session option determines what happens on the line when data is received on
a link for which there is no Read session (Section 2.4 on page 42) currently attached.
Under ordinary circumstances a link has a Manager session reading incoming data and
transmitting outgoing data, or it has a Manager session sending data and a Read session
receiving incoming data. If the Read session for a particular link doesn’t exist, and this