GE AF-600 FP Design Manual page 110

6.3 Network Configuration
6.3.1 Frequency Converter Set-up
Set the following parameters to enable the Drive protocol for the frequency converter.
Parameter Parameter Setting
Number Name
O-30 Protocol Drive
O-31 Address 1 - 126
O-32 Baud Rate 2400 - 115200
O-33 Parity/Stop bits Even parity, 1 stop bit (default)
6.4 Drive Protocol Message Framing Structure
6.4.1 Content of a Character (byte)
Each character transferred begins with a start bit. Then 8 data bits are transferred, corresponding to a byte. Each character is secured via a parity bit, which is
set at "1" when it reaches parity (i.e. when there is an equal number of 1's in the 8 data bits and the parity bit in total). A character is completed by a stop bit, thus
consisting of 11 bits in all.
6.4.2 Telegram Structure
Each telegram begins with a start character (STX)=02 Hex, followed by a byte denoting the telegram length (LGE) and a byte denoting the frequency converter
address (ADR). A number of data bytes (variable, depending on the type of telegram) follows. The telegram is completed by a data control byte (BCC).
6.4.3 Telegram Length (LGE)
The telegram length is the number of data bytes plus the address byte ADR and the data control byte BCC.
The length of messages with 4 data bytes is
The length of messages with 12 data bytes is
The length of messages containing texts is
1) The 10 represents the fixed characters, while the "n'" is variable (depending on the length of the text).
AF-600 FP Design Guide
6
LGE = 4 + 1 + 1 = 6 bytes
LGE = 12 + 1 + 1 = 14 bytes
10 1) +n bytes
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