Ae Bus Protocol; Figure 4-9. Graphic Representation Of A Message Packet - Advanced Energy HFV 8000 User Manual

The host computer must finish one transaction with the HFV generator before it
initiates another, either with the same unit or any other unit.
Note: The HFV generator sends data through pin 2 (TXD.D). This pin must be
connected to the receive pin (RXD.D) on the host computer's PC serial
connector. The receive pin is normally pin 2 for a standard, 9-pin PC serial port
and normally pin 3 for a standard, 25-pin PC serial port.

AE Bus Protocol

The AE Bus protocol uses pure binary data (nothing is coded in ASCII) and is
designed to facilitate direct communications between a host computer and the HFV
generator.
The AE Bus message packet combines a set quantity of bits and bytes in such a way
that groups of information can be sent over communications lines at one time. Five
types of information (fields) make up communications message packets (see
9):
• Header (address and the length of Data field)
• Command Number (the commands are listed in
• Optional Length byte
• Data
• Checksum
Figure 4-9 shows the organization of these fields in the AE Bus message packet. The
subsequent paragraphs describe each field in detail.

Figure 4-9. Graphic representation of a message packet

5705211-C Communication Interfaces
HFV 8000 Generator
Figure 4-
Table 4-7 on page 4-20)
4-13