Hitachi KP-FM500WCL, Operation Manual

Page: 23 / 51

14
4. Comms command data format
(1) Send data and read command (master to slave)
(a) Command data are converted into ASCII code and transmitted.
(b) Comms byte quantity is 18.
(c) Comms data format (transmission sequence).
・
STX (start code) : Code indicating start of text.
1 byte (02h)
・
Text data : Transmit / receive data.
14 byte (ASCII code)
・
ETX (end code) : Code indicating end of text.
1 byte (03h)
・
SUM : XOR result (FFh), of adding STX, Text data, and ETX.
2 byte (ASCII code)
(d) Text data format details (transmission sequence).
・
Status : Transmission data status.
2 byte (ASCII code)
Used for EEPROM write (“00”: write absent, “01”: write present).
・
ID No. : Camera peculiar ID.
KP-FM500WCL and KP-FMD500WCL have (“FF”).
2 byte (ASCII code)
・
Area address : Classification of Send data (“01”) and Read command (“81”).
2 byte (ASCII code)
・
Relative No. : Sets number (“00” to “FF”) for each adjustment item.
2 byte (ASCII code)
・
Data (note) : Sets data to be transmitted.
2 byte x 3 (ASCII code)
Status
2 byte
ID No.
2 byte
Area address
2 byte
Relative No.
2 byte
Data
2 byte x 3
14 byte
S T X
1 byte
Text data
14 byte
E T X
1 byte
S U M
2 byte
18 byte