# Rejection : RJC (4FH)
This
message
is
sent
out
when
there
is
a
need
to
terminate
communication by overriding the current message.
An
RJC
message will be triggered when :
• a
WSD
or
RQD
message has specified
an
illegal data address
or
size,
• the device
is
not
ready for
communication.
·
an
illegal number of addresses or data
has
been detected.
• data transfer has been terminated
by
an
operator.
· a communications error has occurred.
An
ERR
message may be sent out by a device
on
either side
of the
interface.
Communication must be terminated
immediately when either side triggers
an
ERR
message.
Byte
Description
FOH
Exclusive status
41H
Manufactures
ID
(Roland)
DEV
Device
ID
MDL
Model
ID
4FH
Command
ID
F7H
End
of
exclusive
# Example
of
Message Transactions
e
Data
transfer
from device (A)
to
device (B).
I Device (A) I I Device (B) I
[Want
to
send
data]
[Acknowledge]
[Data
set]
[Acknowledge]
[Data
set]
[Acknowledge]
[End
of
data]
[Acknowledge]
• Device (A)
requests
and
receives
data
from
device
(B).
I Device (A) I
[Request
data]
[Acknowledge]
[Acknowledge]
[Acknowledge]
I Device (B) I
[Data
set]
◄
I---------
[Data
set]
-1--------
[End
of
data]
• Error
occurs
while
device
(A) is receiving
data
from
device (B).
1)
Data
transfer
from
device
(A)
tq
device
(B).
I Device (A) I I Device (B) I
-...--------
[Data
set]
[Acknowledge]
-...--------
[Data
set]
(Error)
x
[Communication
error]
[Acknowledge]
-.---------
[Data
set]
(the
same
data
as
above)
2) Device (B)
rejects
the
data
re-transmitied,
and
quits data
transfer.
I Device (A) I
[Acknowledge]
(Error)
x
I Device (B) I
[Data
set]
[Data
set]
[Communication
error]--------1-
(0uit)
-...--------
[Rejection]
3)
Device (A) immediately
quits
data
transfer.
I Device (A) I
[Acknowledge]
(Error)
x
[Rejection]
j Device (B) I
[Data
set]
[Data
set]
(Ouit)
111
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