Connecting The Md720-3 To The Tim And Antenna - Siemens SINAUT ST7 System Manual

Installing and putting a SINAUT modem into operation
5.3 GSM/GPRS modem MD720-3
Antenna connector
The jack for connecting an antenna cable with an SMA connector is located at the top of the
front panel.
● Impedance: Approx. 50 ohms
Connecting to the power supply
Figure 5-1
The screw terminals at the top are for connecting the power supply source:
● 24 V DC (nominal), I
The two screw terminals on the left (24 V) are connected internally (see Figure). The two
screw terminals on the right (0 V) are connected internally.
Installation on a 35 mm standard rail
The MD720-3 is intended for installation on DIN rails complying with DIN EN 50022. There is
a suitable fastener on the rear of the device.
Table 5- 4 Dimensions of the MD720-3 modem
MD720-3
W x H x D (mm)
Depth with connected cable (mm)
5.3.2

Connecting the MD720-3 to the TIM and antenna

The following figure shows how the GSM modem MD720-3 is connected to a TIM over RS-
232 and to an antenna.
186
CAUTION
Only use antennas from the range of accessories SINAUT Telecontrol intended for the
MD720-3 modem. Other antennas may have detrimental effects on the device
characteristics and may even cause damage.
Connector for 24 V DC power supply
typ
260 mA
Dimensions
22.5 x 99 x 114
approx. 170
System Manual, 07/2009, C79000-G8976-C178-07
Station control system