Connection Of The Md720 To The Tim And Antenna; Connecting The Power Supply - Siemens SINAUT ST7 System Manual

Installation, connecting up, commissioning
4.3 Connecting up
RS-485: Connection of the terminating resistor
If you connect a star-shaped network with several dedicated line or dial-up network modems
to the serial interface of the TIM then operate the serial interface with the RS-485 standard.
You set the RS-485 standard in the configuration of the TIM. With a network operating
according to RS-485 you also need to activate the cable terminating resistor of the bus cable
in the configuration.
4.3.3

Connection of the MD720 to the TIM and antenna

The following figure shows how the GSM modem MD720 is connected to a TIM over RS-232
and an antenna.
Figure 4-1
4.3.4

Connecting the power supply

Connecting with the power supply switched off
Connecting the TIM module to a live power supply can damage the module.
Connect the module to the power supply only when the power supply is off.
Low voltage (SELV / PELV)
The power for the device (24 V DC) must be generated as a safe extra low voltage. This
means it must be a SELV (Safety Extra Low Voltage) or PELV (Protective Extra Low
Voltage) according to DIN VDE 0100 Part 410 (IEC 60364-4-41).
94
Connecting the MD720 to a TIM via RS-232 and the antenna
WARNING
WARNING
SINAUT ST7 - Volume 1
System Manual, 11/2018, C79000-G8976-C178-12