Ae Bus Protocol; Header; Figure 4-16. Graphic Representation Of An Ae Bus Message Packet - Advanced Energy Pinnacle Plus+ User Manual

Advanced Energy

AE Bus Protocol

The AE Bus protocol uses pure binary data (nothing is coded ASCII) and is designed
to facilitate direct communications between a host computer and the Pinnacle Plus+
power supply.
The AE Bus message packet combines chunks of information in such a way that much
information can be sent over communication lines at one time. Five types of
information (or "Fields") make up message packets (Figure 4-16):
Figure 4-16 shows the organization of these fields in the AE Bus message packet. The
subsequent paragraphs describe each field.
Note: The message packet features this structure whether the message originates at
7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0

Header

5-bit address
3-bit length

Figure 4-16. Graphic representation of an AE Bus message packet

HEADER
The first byte in each packet contains two pieces of information: five bits contain the
packet address, and three bits contain the data byte count. If the message packet
originates with the host computer (master), the address specifies the packet's
destination (to a Pinnacle Plus+ unit, for example). If the packet is going to the host,
the address specifies the packet's origin (from the Pinnacle Plus+ unit). The address
section of the Header field is five bits long, which allows a total of 32 distinct
4-54
Page 98 of 204
®
• Header (address and length of data field)
• Command (see the command list later in this chapter)
• Optional length byte
• Data
• Checksum (error checking)
the host computer (master node) or the Pinnacle Plus+ unit.
Command
0-FFh
Optional
I/O Communication and Control
Data (0-255 bytes)
7 6 5 4 3 1 0 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0
Checksum
1138
5702269-C
Ex. 1024 Page 98