Denon DN-501C Owner's Manual page 45

n Command Sending Format
Commands are issued using a Command Packet surrounded by the Start Byte and End Byte.
0x F0004003
CommandPacket
(Start Byte)
The Command Packet format is as shown below.
Total Remain
Format Command Command
(0x11) Packet Packet
(1byte) (1byte)
Item Content
Format Fixed as 0x11 in the DN-501C.
Total Command Used to send commands that have parameters that do not fit into the Parameter
Packet Pack. This is 1 when the parameter is less than 80 bytes.
Remain Command Used to send commands that have parameters that do not fit into the Parameter
Packet Pack. This is 0 when the parameter is less than 80 bytes.
Command Consists of 2 bytes from the category code and command.
Parameter Pack Describes the length of the Parameter Pack. The maximum length of the
Parameter Pack is 80 bytes.
Length
Parameter Pack Parameters.
Check Sum All of the bytes from the Format to the Parameter Pack are added, and the top 4
bits and bottom 4 bits are each converted to ASCII code and stored.
n Divided transmission of commands
If a Parameter Pack exceeds 80 bytes, the command is divided and sent.
In this case, the Total Command Packet contains the total number of commands, and the Remain
Command Packet contains the remaining number of transmissions.
n RemainCommandPacket for a command divided and sent in 3 parts
Total Command Packet Remain Command Packet
3
1st
2nd 3
3rd 3
0xF7
(End byte)
Parameter Parameter
Command Check Sum
Pack Length Pack
(2bytes) (2bytes)
(1byte) (0-80bytes)
Description
2 Two Command Packets remain
1 One Command Packet remains
0 No Command Packets remain
The divided Parameter Pack is reconstructed by the receiver, and is interpreted as the parameters for one
command.
1st part
Format-Model ID Total 3 Remain 2 Command Length
2nd part
Format-Model ID Total 3 Remain 1 Command Length
3rd part
Format-Model ID Total 3 Remain 0 Command
Interpretation of
received command
Command
Parameter part 1
n Precautions when dividing commands
DN-501C
Do not send any other commands in between sending parts of divided commands. In such a case,
DN-501C will discard command A.
Commands can be divided to a maximum of 10 parts. Do not divide into 11 or more parts.
Do not divide the command if the parameters are less than 80 bytes.
39 39
Serial remote control function
Sum
Parameter part 1
Sum
Parameter part 2
Length Sum
Parameter part 3
Parameter part 2 Parameter part 3
Controller
Command A
Remain (1)
Command Ｂ
Command A
Remain (０)