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7.3 Message format
Command and data are packed in a message. A message starts with the STX character followed by the message
content. The message ends with an ETX character. The characters allowed in the message content range from
decimal 32 to 255.
Format: STX <message content> ETX
7.4 Message acknowledgement
After receiving a message the camera responds with an acknowledgement character. This can be an ACK character
(positive acknowledgement) or a NAK character (negative acknowledgement).
The ACK response is given when the received message was understood (the content of the message is not
considered).
The NAK response is given when the received message was not understood, which may be the case when invalid
characters are received as message content, or the message overruns the camera receiver buffer capacity.
7.5 Reply messages
When a message is send to the camera that requires data to be transmitted back to the host system this data is
packed in a message and send to the host system after the positive acknowledgement (ACK) character. When the
camera responds with a NAK character no data is send back to the host system.
7.6 Communication timing
The time between the successive characters making up a message is not limited. The camera however, when
transmitting a message to host system, has a time interval between successive characters of less than the time
required for a single character to be transmitted.
7.7 Host system requirements
After transmitting a message to the camera the host system must wait for the camera to reply with an ACK or NAK
character. To prevent lock-up the wait time for the response must be limited by a time-out period. After not receiving
an ACK or NAK character after the time-out period has elapsed the host system must consider the transmitted
message as not being received by the camera. The time-out time to be used for the Adimec-1000m camera should
be at least 200 ms.
Содержание ADIMEC-1000m
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Страница 16: ...14 Figure 2 1 4 crosshead screws that hold the lensmount front view of the camera ...
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Страница 67: ...65 10 MECHANICAL OUTLINE DRAWING Figure 10 1 Mechanical Outline drawing ...