RFL Communications 21 Sub-MUX Manual de usuario descargar pdf (Pagina 14)

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Good to know Terms cont.

• Asynch Comms- (Asynchronous) Uses start and stop and parity is serial

communications. No Clock. (RS232), Protocol standard =

8,N,1 9600 bps (baud rate) MB = 1 Start, 6 Data, 1 Parity, 1

Stop = 9 Bits, MB8 = 1 Start, 6 Data, 1 Parity, 2 Stop = 10

Bits (SEL)

8N1 = 1 Start, 8 Data, 1 Stop = 10 Bits (same as MB8)

8E1/8O1 = 1 Start, 8 Data, 1 Parity, 1 Stop = 11 Bits

8E2/8O2 = 1 Start, 8 Data, 1 Parity, 2 Stop = 12 Bits

6O1 = 1 Start, 6 Data, 1 Parity, 1 Stop = 9 Bits (same as MB

6O2 = 1 Start, 6 Data, 1 Parity, 2 Stop = 10 Bits (same as

MB8 and 8N1and 8N1)

Standards of sending messages

The term DTE Data Terminal Equipment is used to describe the

initiator or controller of the serial connection, typically the computer.

A PLC is defined as a DTE device.

The term DCE Data Communications Equipment describes the device

that is connected to the DTE device such as a modem. the terms are

most often used in reference to serial communications defined by the

EIA RS232 standard

DTE vs. DCE Asynchronous

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RFL Communications 21 Sub-MUX Manual de usuario Pagina 14