3964R

ISO/OSI Model

Applicable Products

The 3964R protocol (also referred to as DUST) provides the link layer functionalities, so it is not a fully functional protocol in a proper sense. It supports transparent transmission of data blocks on point-to-point connections, operating in half-duplex mode.

The physical layer operates in asynchronous standard mode (1 start bit, 8 data bits, 1 parity and 1 stop bit) using the ISO 7 bit character code for control commands (such as DLE, STX, ETX).

There are two variants::

3964
only parity is used to ensure data integrity
3964R
in addition, horizontal parity is used to ensure data integrity

The protocol has been very popular in process automation, in particular for data exchange between devices with Simatic-SPS. 3964R is also used as link layer for a Sinaut 8FW variant.

ISO/OSI Model

7	Application Layer	n/a
6	Presentation Layer	n/a
5	Session Layer	n/a
4	Transport Layer	n/a
3	Network Layer	n/a
2	Link Layer	3964 3964R
1	Physical Layer	RS232 (V.24), RS485

Applicable Products

ipConv

Universal protocol converter for highest degree of flexibility
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