CESAR 1312 (E)
Communication Interfaces
4-47
CESAR™ 1312 Generator
message originates with the CESAR generator, the value specifies the
command to which it is responding. See
“Host Port Commands” on page 4-61
for a complete list of commands.
AE Bus Optional Length Byte
This field supplements the Header field and exists only when the length bits
(bits 0, 1, and 2) in the Header field contain a value of 7 (07h). If the number of
data bytes in the Data field is six or less, then the three length bits in the
Header field are sufficient to represent this amount 0 to 6 (00h to 06h). Since
the Data field may contain up to 255 bytes of information, the Optional Length
byte is required when the Data field is larger than six bytes.
When the Data field is larger than six bytes, the length bits in the header (bits
0, 1, and 2) will equal 7 (07h), and the Optional Length byte will contain a one-
byte value, from 7 to 255 (07h to ffh), representing the number of data bytes in
the Data field.
AE Bus Data Bytes
The Data field may contain from 0 to 255 bytes of binary data. This field
contains command-related data or a command status response (CSR). Since
some commands do not require data, sometimes the Data field is not present.
If the value specified in the length bits (bits 0, 1, and 2) of the Header field is 0
to 6, the CESAR generator expects zero to six data bytes. However, if the
value in the Header field is 7 (07h), the CESAR generator looks for the
Optional Length byte after the Command field and reads this value to calculate
the data byte count.
Unless otherwise specified for individual commands, any value greater than
one byte must be sent and received least significant byte (LSB) first. For
example, if a command contained 7 data bytes made up of one 8-bit value,
one 16-bit value, and one 32-bit value, the 7 data bytes would be sent in the
following order:
0, 2, 1, 6, 5, 4, 3 (0 = 8-bit value, 2 and 1 = 16-bit value, 6 through 3 = 32-bit
value).
AE Bus Checksum Byte
This one-byte field is the last byte in the packet. The value of this byte
depends upon the number of bytes in each of the preceding fields. The
transmitting unit determines this value by accumulating the
exclusive-or
(XOR) of all bytes of the packet up to, but not including, the checksum value.
The receiving unit accumulates the XOR of all bytes of the packet, including
the checksum. If the result is zero, the unit has received the packet intact.
The unit will act on the message
only
if the address is valid and the checksum
is validated as having no parity errors.
Содержание CESAR 1312
Страница 1: ...U s e r M a n u a l s e r v i c e d r e s s l e r c o m CESAR Generator Model 1312 ...
Страница 2: ......
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 ...