AEG 239 D User Manual download pdf (Page 6)

CG–2 239 MOTOR PROTECTION RELAY – COMMUNICATIONS GUIDE

COMMUNICATIONS GUIDE

is important in RS485 communications. Each '+' terminal of every device must be

connected together for the system to operate. See Section 2.1.3 in the 239 Instruction

Manual for details on correct serial port wiring.

CG.1.3 Data Frame Format / Data Rate

One data frame of an asynchronous transmission to or from a 239 consists of 1 start

bit, 8 data bits, and 1 stop bit. This produces a 10 bit data frame. This is important for

transmission through modems at high bit rates (11 bit data frames are not supported

by Hayes modems at bit rates of greater than 300 bps).

Modbus protocol can be implemented at any standard communication speed. The

239 supports operation at 1200, 2400, 4800, 9600, and 19200 baud.

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AEG 239 D User Manual Page 6