ISO-on-TCP connection: TSAP - STEP 7

Communications modules and network components

ft:publication_title
Communications modules and network components
Product
STEP 7
Version
V20
Publication date
11/2024
Language
en-US
ISO-on-TCP connection: TSAP

TSAP format

ISO-on-TCP connections have a TSAP length of 1 to 16 bytes. When you are entering values, the current length is displayed automatically. You can enter local TSAPs and partner TSAPs as a hexadecimal value or as an ASCII string. If you opt for ASCII, the characters you enter are also displayed in hexadecimal format. If you enter them in hexadecimal, any printable characters are displayed as ASCII values (8 hexadecimal characters are visible). If you enter non-printing characters, the ASCII display is disabled (ASCII entry is no longer possible), and the non-printing characters appear as dots.

Note

TSAP length

Do not use length 1 or 2 TSAPs, as these TSAPs are already used for internal purposes.

Local TSAPs and partner TSAPs

Partner and local TSAPs may be the same, since the connection is unique due to the different IP addresses. If you have to set up more than one connection between two devices, then the TSAPs must also be different.

Default TSAPs

For configuring the local and partner TSAPs, there is an "ISO-on-TCP-1" default value for the first connection between two partners (can be changed). The default value "ISO-on-TCP-2" is then suggested for a new connection between the same partners. ISO-on-TCP-1 is then suggested for a new connection with a new partner.