USING THE BDLC PROTOCOL
UNILINK HOST
ADAPTER B–12
USER MANUAL
B.5.7 FRMR
Recovery
The
FRMR response is returned by the adapter when it receives a frame with an
invalid
command, a frame of excessive length, or when the N(R) does not match.
This response includes a three-byte information field in the format shown in
Figure
B–5, with Byte 0 transmitted first.
Rejected Control Field
0 0N(R)
W
012345 67
MSB LSB
N(S)
XZ
First bit transmitted
Byte 0
Byte 1
Byte 2
Y0000
Figure B–5 FRMR Information Field Format
The
Rejected Control Field is the control field from the command frame that is
being
rejected.
N(R) is the adapter
s current receive count.
N(S) is the adapter
s current send count.
Bit Z is set to one when the control field in the frame received contained an
invalid
N(R) number
.
Bit Y is set to one when the information field received exceeds the maximum
length
of 290 bytes.
Bit
X is set to one when the control field in the
frame received is invalid because
the frame contained an information field and the control field command does
not
permit an information field.
Bit
W is set to one when the control field in the frame received is invalid or
not
implemented.