3.8. Advice for communication
If the command packet is transmitted only 4 bytes, then the camera will wait for remain 7
bytes continuously. At that moment, if a new packet is transmitted to the camera, the
previous 4 bytes will be ignored.
If the camera doesn’t send a response packet, there could be some problem in the
communication line or any other communication condition.
If the camera response mode is Skip Command response packet mode, then the camera will
not send Command response packet. Even if the response mode is Skip Command response
packet mode, the Data response packet will be transmitted to the PC.
4. Command List
20/21Z RS-232C Command Reference
All of commands must be capital letters.
‘*’:
Header
‘X’:
Don’t
Care
‘x’:
Not
specified
‘NN’:
Camera
ID
‘YY’:
Check
Sum
‘Z’,’S’,’M’,’P’,’Q’: Command
Option
‘R’:
Response
Packet
Data
‘
‘:
Indicate
Response
packet
(!!):
Caution
The command was allowed at the camera microcomputer version x.x.
Not described: allowed all versions.
4.1. Response
Packet
If the camera receives any command, it will judge the Response packet. If the command
packet hasn’t any error, then the camera will transmit the response packet.
Command Response Packet
It is a response that the camera received the command packet correctly. It has none
information of camera status. It indicates only that the command is successfully
received.
format: * 00 00 00 00 AA
Caution) This manual did Not describe Command response packet.
Data Response Packet
It is a response of the camera status or zoom/focus position, or any other
information of the camera.
format: * QQ RR SS MM YY
Preset Action Finished Response Packet
It is a response that the camera finish moving to the target preset position.
Format: * NN 11 11 11 YY
Doc # APN 20/21Z704 22X
Comm.
Issue Date: 3/25/2005
Revision: E
Page
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