Siemens 6DD1688-1AB0 V.24 Interface Submodule

Siemens 6DD1688-1AB0 V.24 Interface Submodule is the SS2 interface submodule that adds a dedicated RS-232 (V.24) serial port to the SIMADYN D SS4 communications module. It is used in SIMADYN D digital control configurations to provide an extra, independent V.24 channel for serial data exchange between the SIMADYN D controller and external devices such as programming consoles, diagnostic tools, modems, or other automation equipment. The V.24 interface supports standard RS-232 signaling, including data lines TXD and RXD and common control lines CTS, RTS, DTR, and DCD, enabling proper handshaking and remote signaling. The 6DD1688-1AB0 part is documented in Siemens hardware references as the SS2 submodule for SS4 communications, designed to plug into the SS4-based configuration without altering the core SS4 functionality; it is intended for use in appropriate SIMADYN D rack configurations with SS4 modules.