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1.Introduction
This specification describes the RS232C communication protocol between an
Amplifier and a Host Controller.
2. Outline
From the system controller, a command is transmitted to the Amplifier from the
Host Controller, and the Amplifier / Receiver. A received command changes an
internal state according to the contents of the message, or answers the Host
Controllers requested Status.
3. Communication format
It is Based on RS-232C format.
Baud Rate : 9600bps
Data Bits : 8bit
Parity : No
Stop Bits : 1
4. Regulation on communication
-Amplifier must return a message of less than 500m sec on
reception of a command from Host Controller.
-Host Controller must not transmit the following command, before
receiving the reply from the Amplifier to a transmitting command.
-Host Controller must not open 10 or more m seconds of sending-out
intervals of each byte in a transmitting message.
-As long as there is no request from Host Controller, even if
Amplifier changes internal status etc., it must not transmit
a message to Host Controller.
5. Data Format (Host Controller <-> Amplifier)
STX + BC + PDC + CMD + Data1 + ----- + DataN + CS
The terminological definition is as follows.
STX 02 H : Start of text code
BC : Byte Count
(Number of bytes of until before CS from PDC.)
PDC : Product Code
CMD : Command (Opecode)
DataN : Data Block ( 0 < M + FAH )
CS : Check Sum
A value from which 8 bits of low ranks of the sum
from BC to CS are set to 0.