Specifications

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Protocol Parameters ABB CS31 Section 15-3
15.1 General Information
The operating terminals can be easily connected to ABB CS31 controllers.
The programming interface COM1 is used to connect the operating terminal.
Data traffic on the interface is handled by the ASCII plain text protocol.
The software components of the system are fully adapted to the parameters and
marginal conditions of the programming unit (PU) interface.
This offers the user the following advantages:
- Random read and write access to all data within the PLC.
- The operating terminal automatically polls the freely definable data areas for
cyclic data.
- No configuration effort required within the PLC.
- The PU protocol is handled entirely by the firmware of the PLC. A PLC program
(function blocks, etc.) in the PLC is not required for communication handling.
- The interface parameters of the interface SER1 are defined in the programming
software in a protocol-specific manner and are stored in the application descrip-
tion. The parameters can also be modified in the setup mask or any other I/O
mask of the operating terminal at any time.
- The programming system offers the user a maximum of support in programming
the operating terminal. The definitions (abbreviations) used here are identical
with the definitions used within the PLC program.
15.2 Technical Description
COM1 and the ASCII plain text protocol are used to connect the operating terminal
to ABB CS31 controllers.
This protocol allows random read and write access - in bit, word and double-word
mode - to all relevant PLC data.
15.3 Protocol Parameters ABB CS31
The interface parameters of the operating terminal are adapted to the default para-
meters of the PU interface.
To ensure proper connection, do
not modify the parameters in the terminal.
Baud rate: 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 357000,
500000 Baud
Parity: none, even, odd
Data bits: 5, 6, 7, 8
Stop bits: 1, 1.5, 2
Handshake: No handshake, hardware, software