Appendix - NEC MultiSync IDC-3000 User Manual

APPENDIX

You can control the main functions from external equipment such as
personal computer using the PC-CONTROL terminal. The following
sections explain the interface.
Interface Condition
• RS-232C or RS-422
• Baud rate ............................... 9600 bps
• Data length ............................ 8 bits
• Parity ..................................... Odd parity
• Stop bit .................................. 1 bit
• Communications mode ......... Full duplex
Command Communication Sequence
When external equipment such as a personal computer gives the command to
the IDC-3000, the IDC-3000 returns an ACK or NAK. So make sure that the
external equipment receives this ACK or NAK.
Command sending/receiving sequence
External equipment
(PC)
ACK or NAK
(NAK only when accessing EEPROM)
The IDC-3000 returns an ACK if it has received the command correctly.
If it has not received the command correctly due to data error, it will return a
nothing. Therefore, when the external equipment send a command, make sure
that it received the ACK.
The IDC-3000 returns a NAK only when a WRITE error has occurred during
EEPROM access commands.
(IDC-3000 stand alone PC-CONTROL command reference)
Command
IDC-3000
Control Data Format
8 bit 8 bit 8 bit 8 bit
Command 2
UNIT ID
Command 1
• Command 1 ........ Code based on the command system
• UNIT ID ............. Code allocated to each equipment
(Allocate 20H to the IDC-3000)
• Command 2 ........ Code allocated to the main functions of the IDC-3000
• Data Length ........ Number of bytes of the data that is transmitted
• Data .................... Data that is transmitted
• Check Sum ......... Lower eight digits of sum total of the first byte to the
byte just before the last
8 bit 8 bit 8 bit
Check Sum
Data
Data length
Z
8 bit
[