Siemens SINAUT ST7 - Page 248

Installing and putting a SINAUT modem into operation
5.7 Analog dial-up modem MD3
Station control system
248 System Manual, 07/2009, C79000-G8976-C178-07
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Figure 5-38 Connecting an MD3 to a TIM over RS-232, 2-wire end point variant
Please follow the instructions in the figure above to ensure problem-free operation,
Note
Any TIM with an RS-232 port can be used, in other words, the TIM 3V-IE variants, the
TIM 4R-IE and all TIM 4 types.
Connecting several MD3s with a TIM over the RS-485 port
Several MD3 modems can be connected to a TIM over the RS-485 port. This type of
configuration is necessary when several dedicated lines come together on one TIM; in other
words when connecting a star network. The following figure shows this configuration with
standard components.