Contec F&eIT Series User Manual page 59

8. System Reference
Commands in detail
The following command is set in the command section (Offset = 4 in the F&eIT Protocol header
section):
7 6
ACK
Figure 8.4. Command Structure
Bits 0 to 6 represent the command; the MSB indicates a response frame (ACK).
Bit 7 = 0: command request
1: command response
Table 8.8. Commands in Detail
Comman
Command description
d number
Reads from a virtual
1
address.
Writes to
2
a virtual address.
Transmits
3
messages.
Trap
4
Reset
5
7 to 127 Reserved
Command-issuing procedure
- Read a virtual address (command = 1)
A virtual address and its size are specified, and the frame is transmitted to the target device. The
result is received as a response frame with data. (Example: reading a vendor name)
52
5 4 3
Command (1 - 127)
Type
Response Reads device information by specifying
a virtual address.
Response Updates
specifying a virtual address.
Response Exchanges messages between devices.
Trap Transmits trap information from a
device, based on various events.
Response Resets a device after returning a
response frame.
Undefined Undefined
2 1 0
Remarks
device information by
CPU-CA10(FIT)GY, CPU-CA20(FIT)GY