User manual

IEC61131 User and Reference Manual

April 22, 2008

378

ASCII Protocol Parameters

The TeleBUS ASCII protocol is an seven bit character based protocol. The table below

shows possible and recommended communication parameters.

Parameter

Possible Settings

Recommended Setting

Baud Rate

see Baud Rate section below

Data Bits

7 data bits

8 data bits

7 data bits

Parity

None

Even

Odd

none

Stop Bits

1 stop bit

2 stop bits

1 stop bit

Flow Control

Enabled

Disabled

disabled

Duplex

see Duplex section below

Not applicable to SCADAPack 330 or SCADAPack 350 controllers.

NOTE: Flow control should never be enabled with modems or in noisy environments. Noise

can result in the accidental detection of an XOFF character, which shuts down

communication. Flow control is not recommended for any environment, but can be

used on high quality, full duplex, direct wiring where speeds greater than 4800 baud

are required.