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2.5.1
GSM modem MD720-3
With the GSM modem MD720-3, a TIM can transmit data by establishing a dial-up
connection over a mobile wireless network (CSD: Circuit Switched Data). The maximum data
transmission speed is 9600 bps.
Data can be transmitted between two SINAUT subscribers both from mobile wireless to
mobile wireless(from GSM modem to GSM modem) and from mobile wireless to fixed
network (phone or ISDN attachment; ISDN is recommended).
Apart from transmitting data, the MD720-3 can also be used to send SMS messages directly
to personnel on call. Receipt of the SMS can be acknowledged using the mobile phone. If no
acknowledgement is received, it is possible to send the SMS to a different mobile phone.
With this type of data transmission, the GSM provider charges for duration of dial-up
connections or the number of SMS messages sent.
Note
The MD720-3 modem is used not only in SINAUT ST7 but also in SINAUT MICRO. In this
case, S7-200 stations can transmit data over GPRS using the MD720-3. In SINAUT ST7, the
MD720-3 cannot be used for GPRS but only for CSD!
The MD720-3 can be attached to the RS-232 port of a suitably equipped TIM module (all
TIM 3V-IE and TIM 4 variants). It can be installed on a 35 mm standard rail.
The cable for connecting the MD720-3 must be ordered separately with a TIM.
Figure 2-13
SINAUT ST7 Station control system - System Manual
System Manual, 05/2007, C79000-G8976-C178-06
Modem MD720-3
Introduction to the SINAUT ST7 system
2.5 Mobile wireless components
65
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