User`s guide

36 DC 900-1340I
BSC Programmer’s Guide
The valid BSC 3270 access modes are defined in Ta bl e 2 –1 . Ta ble 2 –2 shows the required
access modes for various operations.
Note
The concept of a Control session is unique to Protogate’s BSC
product. Do not confuse it with the terms “control station” and
“control unit,” which are defined by the BSC 3270 protocol. You
can have a Control session on either a control station or a control
unit (tributary station). The Manager session moves the real data;
the Control session only allows reporting of statistics, etc.
Table 2–1: BSC 3270 Session Access Modes
Mode Usage
Manager Set Manager mode for a session by setting the DLI “mode” configuration
parameter to “mgr.” Manager mode gives the client the right to issue any com-
mand or request. There can be only one Manager session per link.
Read Set Read mode for a session by setting the DLI “mode” configuration parame-
ter to “read.” Read mode gives the client the right to issue the same commands
as Manager mode. The main difference between the two modes is that when a
Read session is present, all incoming serial line data read from the link is sent
to the Read session only. Additionally, the safe store acknowledgment is sent to
the Read session, even if the command is issued by the Manager session (the
Manager session receives no acknowledgment). All error reports are dupli-
cated and sent to both the Manager and Read sessions. Only one Read session
is allowed per link.
Control Set Control mode for a session by setting the DLI “mode” configuration
parameter to “control.” The Control session may not transmit data and does
not receive incoming data. Any Manager session for the link with an active
Control session does not receive copies of responses to commands sent by the
Control session. There can be only one Control session per link.