These flags identify the type of data stream that can be used.
They are specified for the primary logical unit (bytes 17 and 18)
and for the secondary logical unit (bytes 22 and 23). Both bytes have
the same format; however, different bits can be set for the primary
and secondary logical units. The following data stream subset flags
can be set:
- Bit setting
0123 4567
- (Bytes 17 or 22) Meaning
- 1... ....
- The primary or the secondary LU can send an interactive data
stream (BS, CR, LF, HT, VT, ENP, and INF).
- 0... ....
- The primary or the secondary LU does not send an interactive
data stream (BS, CR, LF, HT, VT, ENP, and INP).
- .1.. ....
- The primary or the secondary LU can send a horizontal format
data stream (SHF) with parameters.
- .0.. ....
- The primary or the secondary LU does not send a horizontal format
data stream (SHF).
- ..1. ....
- The primary or the secondary LU can send a vertical format data
stream (SVF) with parameters.
- ..0. ....
- The primary or the secondary LU does not send a vertical format
data stream (SVF).
- ...1 ....
- The primary or the secondary LU can send vertical channel, including
vertical format and vertical channel select (VCS) with parameters.
- ...0 ....
- The primary or the secondary LU does not send vertical channel,
including vertical format and vertical channel select (VCS) with parameters.
- .... 1...
- SLD (Set Line Density) is supported.
- .... 0...
- SLD (Set Line Density) is not supported.
- .... ..1.
- The primary or the secondary LU can send BEL.
- .... ..0.
- The primary or the secondary LU does not send BEL.
- .... ...1
- The primary or the secondary LU can send a transparency data
stream (TRN and IRS).
- .... ...0
- The primary or the secondary LU does not send a transparency
data stream (TRN and IRS).
- .... .x..
- Reserved.
- Bit setting
0123 4567
- (Bytes 18 or 23) Meaning
- 1... ....
- The secondary LU initiates unattended (byte 18 only).
- 0... ....
- The secondary LU initiates attended (byte 18 only).
- .1.. ....
- During the session, the secondary LU can alternate between attended
and unattended (byte 18 only).
- .0.. ....
- During the session, the secondary LU does not alternate between
attended and unattended (byte 18 only).
- ..xx xxxx
- Reserved (byte 18 only).
- xxxx xxxx
- Reserved (byte 23 only).
z/OS Communications Server: SNA Programming
Copyright IBM Corporation 1990, 2014