Roland D-50 - Page 111

# Rejection: RJC (4FH)
‘This messaye 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 cither side triggers an ERR message.
Exclusive status
Manufacturer ID (Roland)
Device ID
Modet ID
Command ID
End of exclusive
# Example of Message Transactions
@Data transfer from device (A) to device (B).
;
(Want to send data] —————1+>
—<-—--_—_ [Acknowledge]
(Data set} rr
4 [Acknowledge]
(Data set} Sana
—at--—_——————. [Acknowledge]
[End of data} + $e
<—-———____——- [Acknowledge]
@Oevice (A) requests and receives data from device (B).
(Request data} ———----_____
—_—_—__—_—__—_-— {Data set]
{Acknowledge} ——-————3
—--—_—________—— [Data set]
[Acknowledge] ————_______-
——_—__—————-— [End of data}
[Acknowledge]_§ _———————
@Error occurs white device (A) is receiving data from
device (8).
1) Data transfer from device (A) to device (8).
Device
—_—________ [Data set]
[Acknowledge] SEE
(Error) x —_—_———————_——_—————— [Data set]
[Communication error),
$$ [Data set]
: (the same data
(Acknowledge) Css above)
2) Device (B) rejects the data re-transmitied, and
quits data transfer.
~<______——- [Data set
fAcknowledge}), =| ————>
(Error) x ~——_—————_—_-—— [Data set]
[Communication error] —————_
(Quit) ——-—--———_ [Rejection}
3) Device (A) immediately quits data transfer.
————_-——-—_ (Data set}
[Acknowledge) —§ ————
(Error) x << [Data set]
[Rejection) a oe (Quit)