VIPA SSM-BG41 - Fig. 3-20: Allocation of Terminal Pins When Using RS422 P and RS485 P Modules; Fig. 3-21: Two-Wire Bus Connection

Manual BG41/BG42/BG43 Interface modules
Rev. 99/49 3-21
3.2.5.2 Allocation of RS422P and RS485P terminal pins
Fig. 3-20: Allocation of terminal pins when using RS422P and RS485P modules
3.2.5.3 Two-wire Bus Connection
By linking Rx+ and Tx+ or Rx- and Tx- it is possible to produce a two-wire bus connection. The
RS485 interface uses the two-wire connection.
Due to the links, the sent data is immediately recoupled. The recoupled data is to be filtered by
using software. With the RS485P module the receiver is switched off at transmission and thereby
disables the recoupling.
Fig. 3-21: Two-wire bus connection