Yamaha n8 Service Manual page 76

n8/n12
• SSP1 (Main) ⇔ SSP1 (Sub) A-BUS connection test
A-BUS uses 16-line mode. Transmits test data of about 16 ch
from Main to Sub, and from Sub to Main using frame A, and
reads at reception side, and judges as OK if the data is the
same as the transmitted data.
2-5-3. Execution of test from PC
(1) Transmits the MIDI command (A0 45 00) to execute the
test.
(2) MIDI command (A0 45 02) will be received if the test
result is OK and MIDI command (A0 45 03) will be
received if the test result is NG.
• Example of executing screen
* Refer to "3. List of test items" for details. (Page 80)
2-6. Test around UART
2-6-1. Outline
Conducts MIDI loopback test between SSP1 ⇔ DICEII (UART
[0]) and MIDI loopback test between DICEII ⇔ MIDI port
(UART [1]).
2-6-2. Test contents
• MIDI loopback test between SSP1 ⇔ DICEII (UART [0])
Indicates from the SSP1 to DICEII to directly connect MIDI
IN/OUT via MCI.
Outputs test data from SSP1 and checks by comparing data
loopbacked by DICEII and output data.
76
Personal computer
MIDI IN
UART[1]
SSP1 (Main)
UART[0]
• MIDI loopback test between DICEII ⇔ SSP1 ports
(UART [1])
Sets up the UART Router of CPLD so that the DICEII and
MIDI port are connected with UART [1].
Outputs MIDI command (A0 47 02) for loopback test from
DICEII to MIDI.
When it is received by the personal computer, MIDI
command (A0 47 00) is output to MIDI as a reply.
The loopback test is judged as OK if it is received by the
DICEII.
Personal computer
MIDI IN
SSP1 (Main)
UART[0]
· When the test is fi nished, the connection for testing will be
automatically restored.
2-6-3. Execution of test from PC
(1) Transmits the MIDI command (A0 46 00) to execute the
test.
(2) If MIDI command (A0 47 02) is received, MIDI command
(A0 47 00) will be transmitted within 5 seconds.
(3) MIDI command (A0 46 02) will be received if the test
result is OK and MIDI command (A0 46 03) will be
received if the test result is NG.
MIDI OUT
DICEII
MIDI IN/OUT directly connected
Responds to command
transmitted from the
MIDI OUT
DICEII.
UART[1]
DICEII