IBM 3708 Description page 73

Nonsequenced Commands and Responses
The following nonsequenced commands and responses are supported by the 3708:
Command/Response C-Field Hex Code
Set Normal Response 100POOll 93
Mode (SNRM) Command 01234567
Disconnect 010POOli
53
(DISC) Command 01234567
Unnumbered Acknowledgment 011FOOII
73
(UA) Response
01234567
Disconnect Mode 000Fll11 IF
(OM) Response 01234567
Frame Reject
100FOIli 97
(FRMR) Response 01234567
Test Command/Response 1 1 1 P/F 0 0 1 1
F3
0123 4567
Exchange Station ID 1 0 1 P/F 1 1 1 1 BF
Command/Response 0123
4567
The SNRM command sets the 3708 in Normal Response mode. Receipt of SNRM
causes the 3708 to deactivate the physical unit if it is in active state.
The DISC command sets the 3708 in NDM.
The UA response is sent by the 3708 to acknowledge receipt and acceptance of an
SNRM or DISC command.
The Test command is used to initiate one round-trip transmission of test data both
in NRM and NDM. The 3708 returns the Test response.
The Disconnect Mode (DM) response is sent by the 3708 in normal disconnect mode
(NDM) to request online status. DM is sent in response to any command except
Test and exchange identification (XID).
The FRMR response is implemented by the 3708 as described in IBM Synchronous
Data Link Control General Information, GA27-3093. The FRMR is sent in response
to any poll until an SNRM or DISC is received to reset the 3708
The XID command and response contains additional data beyond the C byte. The
3708 responds to the XID command in NRM or NDM, except when an FRMR
condition exists, in which case the FRMR response takes precedence over XID. The
additional data of the XID response consists of 48 bits defined as:
Bits
0-3
4-7
8-15
16-27
28-47
34
IBM 3708 Description
Meaning
ID format B' 0000 '
PU type B'0010'
Self-description X' 00'
X'04B'
TerminalID
=
0