NEC XP29 Plus Manuale Utente

When external equipment such as a personal computer gives the command to

the XP29 Plus/XM29 Plus, the XP29 Plus/XM29 Plus returns an ACK. So

make sure that the external equipment receives this ACK.

The XP29 Plus/XM29 Plus 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

nothing. Therefore, when the external equipment send a command, make

sure that it received the ACK.

You can control the main functions from external equipment such as personal

computer using the PC/EXT CTL terminals. The following sections explain the

interface.

Interface Condition

 • RS-232C

 • Baud rate ------------------------- 9600 bps

 • Data length ----------------------- 8 bits

 • Parity ------------------------------- Odd parity

 • Stop bit ---------------------------- 1 bit

 • Communications mode -------- Full duplex

 Command 1 ........ Code based on the command system

 UNIT ID ............... Code allocated to each equipment  (Allocate 80H to the

XP29 Plus/XM29 Plus)

Command 2 ......... Code allocated to the main functions of the XP29 Plus/XM29

Plus

 Data Length ........ Number of bytes of the data that is transmitted

 Data .................... Data  transmitted

 Check Sum ......... Lower eight digits of sum total of the first byte to the byte

immediately before the last.