CESAR 1312 (E)
Communication Interfaces
4-49
CESAR™ 1312 Generator
•
If the address does not match, the CESAR generator does not respond to
the host computer; the CESAR generator resets and resumes waiting for
a message addressed to it. If the address matches but the
exclusive-or
(XOR) sum of the bytes in the packet (including the checksum) is not zero,
the CESAR generator sends a negative acknowledgment (NAK),
hexadecimal 15h, to the host computer.
•
If the address matches and the message is intact, the CESAR generator
sends an acknowledgment (ACK), hexadecimal 06h, to the host computer.
If the CESAR generator receives a request for data or status information, it
gathers and sends the requested information. Otherwise, it evaluates the
incoming command and sends a message packet that contains a one-byte
data value (CSR code) to the
Host
(see
Response (CSR) Codes” on page 4-62
). CSR code 0 is sent when the
command has been accepted.
If the
Host
receives a NAK (15h) from the CESAR generator, the
Host
either
retransmits the packet or does whatever else it has been programmed to do in
this situation. If the
Host
receives an ACK (06h), it waits for the requested
data or status information, or it waits for the CSR code telling it whether or not
the new parameter was accepted. If the
Host
receives no response within a
reasonable period, it takes whatever action it has been programmed to take.
T
2
: Unit Transmits Response to Host
The CESAR generator prepares a response packet with the requested
information or appropriate CSR code, which it then transmits to the host
computer. The host computer then determines, by means of the checksum, if
the response packet is complete. If the host computer detects an error in the
transmission (the checksum is not validated), it can request the packet be sent
again by transmitting a NAK (15h).
T
3
: Host Acknowledges Unit Response
If the CESAR generator receives an ACK (15h) from the host computer, it
returns to the normal waiting state. If the CESAR generator receives a NAK
(06h) from the host computer, the CESAR generator retransmits the response
packet. The CESAR generator continues to retransmit in response to NAK
transmissions until the host computer stops the cycle. If the CESAR generator
receives no response, it assumes an ACK and returns to the waiting state.
Содержание CESAR 1312
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Страница 3: ...User Manual CESAR Generator Model 1312 CESAR 1312 E ...
Страница 6: ...iv CESAR 1312 E Dressler HF Technik GmbH ...
Страница 14: ...xii List of Tables CESAR 1312 E Dressler HF Technik GmbH ...
Страница 24: ...1 10 Safety and Product Compliance Guidelines CESAR 1312 E Dressler HF Technik GmbH ...
Страница 34: ...3 8 Specifications CESAR 1312 E Dressler HF Technik GmbH ...
Страница 170: ...5 50 Installation Setup and Operation CESAR 1312 E Dressler HF Technik GmbH ...
Страница 188: ...6 18 Troubleshooting and Customer Support CESAR 1312 E Dressler HF Technik GmbH ...