Installing and putting a SINAUT modem into operation
5.3 GSM/GPRS modem MD720-3
Station control system
186
System Manual, 07/2009, C79000-G8976-C178-07
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
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.
Connecting to the power supply
9
9
Figure 5-1
Connector for 24 V DC power supply
The screw terminals at the top are for connecting the power supply source:
●
24 V DC (nominal), I
typ
260 mA
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
Dimensions
W x H x D (mm)
22.5 x 99 x 114
Depth with connected cable (mm)
approx. 170
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.