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®
Advanced Energy
• Command number
• Optional length byte
• Data
• Checksum
Figure 4‑15
The subsequent paragraphs describe each field in detail.
Command number
Header
5-bit address
3-bit length
Figure 4‑15. Graphic representation of a message packet
AE BUS HEADER BYTE
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, the address specifies the packet destination (to the
Paramount MF 2 kW unit, for example). If the packet is going to the host, the address
specifies the packet origin (from the Paramount MF 2 kW unit). The address section
of the header field is five bits long (bits 3 to 7), which allows a total of 32 distinct
addresses. Address 0 (zero) is reserved for the network broadcast address, which the
Paramount MF 2 kW unit does not support.
The remaining three bits (bits 0, 1, and 2) are the length bits. These bits tell the
receiving unit how long the data field is so that the unit can determine when it has
received the entire message. If the data field contains more than six bytes, the value
of these three bits will be set to 7 (07h), and the optional length byte field will
contain a value indicating the number of data bytes in the data field.
☞
Important
The value of these bits refers only to the number of actual data bytes in the
data field. Do not include the checksum byte when calculating the value for
these bits.
AE BUS COMMAND NUMBER BYTE
This 1-byte field contains an 8-bit value from 0 to 255 (00h to ffh) representing the
command number. If the message packet originates with the host computer, this value
57020114-00E
shows the organization of these fields in the AE Bus message packet.
0-255
Optional length byte
Communication Controls
®
Paramount
MF 2 kW Generator
Data (0-255 bytes)
Checksum
4‑15
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Troubleshooting
