RCA 70/700 Series Reference Manual page 70

Error and End
Optional
CAUSES OF MR, ER,
AND LOR REPORTS
Communication Buffers
• This report indicates that ER and END conditions as previously
indicated have occurred since the previous SEL to the particular buffer.
• These reports indicate a condition unique to a particular buffer which
is to be reported to the program in a coordination message. No action
other than the generation of the coordination message is performed by the
CCM.
RPT 3 RPT 2
RPT 1
Report or Condition
0 0 0
Quiescent
0
0
1
End
0 1
0 Error
0 1 1
End and Error
1 0 0
Malfunction
1 0
1 Ring
1 1 0
Optional 1 (LDR, BDR*)
1 1
1 Optional 2
*Break Disconnect Report - 70/720-22.
• Malfunction, Error, and Line Disconnect Reports are reported to the
CCM by the buffers as a result of certain detected conditions normally
related to the communication line, the data set, or the automatic calling
unit. The following is a list of the reports generated to the various buffers
depending upon the abnormal conditions present:
Buffer Report Command
Condition Reported
70/710 MR TC
Bit-echo check failure.
70/715
MR
TC Loss of
oop
from VRU.
ER TC Presence of data in 70/715
at the end of a WT pulse.
LDR TC
Absence or loss of DSR.
LDR RC Loss of DSR.
70/720-11,21
MR TC Loss of DSR.
RC Loss of DSR.
ER TC Loss of RD or SRD.
RC Loss of DCD.
70/720-22 MR
TC Loss of DSR.
MR
RC Loss of DSR.
ER TC Loss of CTS.
4-4