The subrecord control byte (SRCB) is interpreted according to the
RCB value, as shown in the following figures. The SRCB defines the
record type (job header, data set header, job trailer, or user data
record) plus SYSOUT carriage control type and user data spanning indicators
(first, last, or middle segment). See Format of Data Records Containing Spanned Data for
additional information on records containing spanned data.
Table 1. SRCB
Definition - Part 1| RCB |
SRCB |
|---|
| 00 |
None |
| 90 |
RCB of stream to be initiated |
| A0 |
RCB of stream to be initiated |
| B0 |
RCB of stream to be cancelled or rejected |
| C0 |
RCB of completed stream |
| D0 |
RCB of ready stream receiver |
| E0 |
Expected count - BCB sequence error (received
count is in BCB) |
| F0 |
An identification character as follows: - A = Reserved
- B = Network SIGNOFF
- C-H = Reserved
- I = Initial network SIGNON
- Must be only record in transmission buffer
- J = Response to initial network SIGNON
- Must be only record in transmission buffer
- K = Reset network SIGNON
- L = Accept (concurrence) network SIGNON
- M = Add network connection
- N = Delete network connection
- O-R = Reserved for IBM's use
- S-Z = Unused
|
| 91-94 |
Reserved |
Note: F0 records are not compressed. Except where noted
(I and J), multiple F0 records may be blocked in a single transmission.
F0 records cannot be blocked with other records within a transmission.
Table 2. SRCB
Definition - Part 2| RCB |
SRCB |
|---|
| 95-F5 |
Reserved |
| 96-F6 |
Undefined |
| 97-F7 |
Undefined |
| 98-F8 |
NJE SYSIN control information as follows: - 1000 0000 - Standard record
- 1100 0000 - Job header
- 1110 0000 - Data set header
- 1101 0000 - Job trailer
- 1111 0000 - Reserved
- 1111 0000 - Reserved for IBM's use
|
| 99-F9 |
NJE SYSOUT control information as follows: - 10cc 0000 - Carriage control type as follows:
- 1000 0000 - No carriage control
- 1001 0000 - Machine carriage control
- 1010 0000 - ASA carriage control
- 1011 0000 - CPDS page mode records (with carriage control)
- 10cc ss00 - Spanned record control as follows:
- 10.. 0000 - Standard record (not spanned)
- 10.. 1000 - First segment of spanned record
- 10.. 0100 - Middle segment of spanned record
- 10.. 1100 - Last segment of spanned record
- 11cc 0000 - Control record as follows:
- 1100 0000 - Job header
- 1110 0000 - Data set header
- 1101 0000 - Job trailer
- 1111 0000 - Reserved for IBM's use
|
| 9A |
Operator Command/Message (NMR) |
Network Job Entry (NJE) Formats and Protocols
Copyright IBM Corporation 1990, 2014