VIPA SSM-BG41 - Fig. 3-11: Allocation of Terminal Pins When Using a 20 Ma Current Loop Module; Fig. 3-12: Allocation of Terminal Pins When Using a RS232 C-Module

Manual BG41/BG42/BG43 Interface modules
Rev. 99/49 3-13
3.2.3.2 Allocation of terminal pins when using a 20mA current loop module
Details on the 20mA current loop module can be found in chapter 3.2.1.
Fig. 3-11: Allocation of terminal pins when using a 20mA Current Loop Module
3.2.3.3 Allocation of terminal pins when using a RS232C-module
Details on the RS232C module are to be found in chapter 3.2.2..
Fig. 3-12: Allocation of terminal pins when using a RS232C-module
The switchover between both forms of operation occurs through pin 20 on the 25-pole SubD
socket:
•= Pin 20 on ground → Operation as a RS232C module
•= Pin 20 open → Operation as a 20mA Current Loop module