216
MIDI Implementation

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Data Transmission

This instrument can use exclusive messages to exchange many varieties of internal settings
with other devices.
The model ID of the exclusive messages used by this instrument is 00H 00H 15H.

❍

Data Request 1 (RQ1)

This message requests the other device to transmit data. The address and size indicate the
type and amount of data that is requested.
When a Data Request message is received, if the device is in a state in which it is able to
transmit data, and if the address and size are appropriate, the requested data is transmitted
as a Data Set 1 (DT1) message. If the conditions are not met, nothing is transmitted.
Status data byte status
F0H 41H, dev, 00H, 00H, 15H, 11H, aaH, bbH, ccH, F7H
ddH, ssH, ttH, uuH, vvH, sum
Byte Remarks
F0H Exclusive status
41H ID number (Roland)
dev device ID (dev: 10H - 1FH, 7FH)
00H model ID #1 (JUNO-G)
00H model ID #2 (JUNO-G)
15H model ID #3 (JUNO-G)
11H command ID (RQ1)
aaH address MSB
bbH address
ccH address
ddH address LSB
ssH size MSB
ttH size
uuH size
vvH size LSB
sum checksum
F7H EOX (End Of Exclusive)
* The size of data that can be transmitted at one time is fixed for each type of data. And
data requests must be made with a fixed starting address and size. Refer to the address
and size given in
Parameter Address Map
(p. 222).
* For the checksum, refer to p. 239.
* Not received when the Receive Exclusive parameter (SYSTEM/MIDI) is OFF.

❍

Data set 1 (DT1)

Status Data byte Status
F0H 41H, dev, 00H, 00H, 15H, 12H, aaH, bbH, F7H
ccH, ddH, eeH, ... ffH, sum
Byte Explanation
F0H Exclusive status
41H ID number (Roland)
dev Device ID (dev: 00H - 1FH, 7FH)
00H Model ID #1 (JUNO-G)
00H Model ID #2 (JUNO-G)
15H Model ID #3 (JUNO-G)
12H Command ID (DT1)
aaH Address MSB: upper byte of the starting address of the data to be sent
bbH Address: upper middle byte of the starting address of the data to be sent
ccH Address: lower middle byte of the starting address of the data to be sent
ddH Address LSB: lower byte of the starting address of the data to be sent.
eeH Data: the actual data to be sent. Multiple bytes of data are transmitted
in order starting from the address.
: :
ffH Data
sum Checksum
F7H EOX (End Of Exclusive)
* The amount of data that can be transmitted at one time depends on the type of data, and
data will be transmitted from the specified starting address and size. Refer to the address
and size given in
Parameter Address Map
(p. 222).
* Data larger than 256 bytes will be divided into packets of 256 bytes or less, and each
packet will be sent at an interval of about 20 ms.
* Regarding the checksum, please refer to p. 239.
* Not received when the Receive Exclusive parameter (SYSTEM/MIDI) is OFF.
Status Data byte Status
F0H 41H, dev, 42H, 12H, aaH, bbH, ccH, F7H
ddH, ... eeH, sum
Byte Explanation
F0H Exclusive status
41H ID number (Roland)
dev Device ID (dev: 10H - 1FH, 7FH)
42H Model ID (GS)
12H Command ID (DT1)
aaH Address MSB: upper byte of the starting address of the transmitted data
bbH Address: middle byte of the starting address of the transmitted data
ccH Address LSB: lower byte of the starting address of the transmitted data
ddH Data: the actual data to be transmitted. Multiple bytes of data are
transmitted starting from the address.
: :
eeH Data
sum Checksum
F7H EOX (End Of Exclusive)
* The amount of data that can be transmitted at one time depends on the type of data, and
data will be transmitted from the specified starting address and size. Refer to the address
and size given in
Parameter Address Map
(p. 222).
* Data larger than 256 bytes will be divided into packets of 256 bytes or less, and each
packet will be sent at an interval of about 20 ms.
* Regarding the checksum, please refer to p. 239.
* Not received when the Receive Exclusive parameter (SYSTEM/MIDI) is OFF.
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