NEC R 37 Xtra User Manual
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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
XP37 Xtra/XM37 Xtra)
Command 2 ......... Code allocated to the main functions of the XP37 Xtra/XM37
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
Command reference
Command Communication Sequence
When external equipment such as a personal computer gives the command to
the XP37 Xtra/XM37 Xtra, the XP37 Xtra/XM37 Xtra returns an ACK. So make
sure that the external equipment receives this ACK.
The XP37 Xtra/XM37 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
External equipment
(PC)
XP37 Xtra/XM37 Xtra
Command
ACK
XP37 Xtra/XM37 Xtra
→
PC
Example: Input switching (VIDEO 1) from the PC to the XP37 Xtra/XM37
Xtra(when the address selector equals 0)
PC
→
XP37 Xtra/XM37 Xtra
XP37 Xtra/XM37 Xtra
→
PC
COM1
9F
Contents
Power On
Power Off
Degauss Control
Length
00
00
00
COM2
4E
4F
A1
COM1
3F
7F
Contents
Power On (ACK)
Power Off (ACK)
Input Switching (ACK)
Degauss Control(ACK)
Length
00
00
00
01
COM2
4E
4F
B0
A1
PC CONTROL COMMAND LIST FOR USE WITH THE XP37 Xtra/XM37 Xtra
PC
→
XP37 Xtra/XM37 Xtra
COM1
DF
UA
80
COM2
B0
Length
02
Data 1
00
Data 2
VIDEO1 : 01
VIDEO2 : 02
RGB1
: 03
RGB2
: 04
Sum
12
13
14
15
COM1
3F
UA
80
COM2
B0
Length
00
Data 1
6F