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Command Communication Sequence

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

the XP29 Xtra/XM29 Xtra, the XP29 Xtra/XM29 Xtra returns an ACK. So make

sure that the external equipment receives this ACK.

The XP29 Xtra/XM29 Xtra 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.

Command sending/receiving sequence

Command reference

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 Xtra/XM29 Xtra)

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

Xtra

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.

Control Data Format

8bit 8bit 8bit 8bit 8bit 8bit 8bit 8bit

Command 1

UNIT ID

Command 2

Data length

Data

Check Sum

External equipment

(PC)

XP29 Xtra/XM29 Xtra

Command

ACK

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 39 40

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