4. Interfaces
Communication is possible with many standard protocols, like SCTM, LSV1, DLMS, IEC1107,
IEC60870 (transparent reading) etc. The interface for connecting the target device can be specified by
plugging the appropriate interface module. The following module types are available now:
•CS (20 mA current loop) interface module, active (supplies current for 4 devices max.) or passive
•RS232 interface module (uses signals RxD, TxD, CTS, RTS, GND, DTR, DCD/DSR)
•RS485 interface module
•M-Bus interface module, active (can supply 10 devices max.) or passive
5. Display
The followingLEDs display the current operating status of the modem and giveinformation about the data
transfer
•Power-LED signals, that the modem is supplied with power.
•GSM-LED permanently off: power down mode
600 ms on / 600 ms off: Limited Network Service: No SIM card inserted
or no PIN entered, or network search in progress, or ongoing user authentication,
or network login in progress
75 ms on / 3 s off: IDLE mode: The mobile is logged to the network (monitoring
control channels and user interactions). No call in progress
permanently on: CSD call: Connection to remote party
•INF-LED’s lights (information): 3 LED’s
first LED on: Modem is ready for operation (15 to 30 sec. after Power On)
•RI-LED lights, when the modem rings
•DCD-LED lights, when the modem has built a data link to remote station
•TxD-LED lights, when data is transferred from modem to target device (e.g. meter)
•RxD-LED lights, when data is transferred from target device to modem
6. Installation Hints
The installation must be done in a way, that even in the case of cable break no dangerous voltages
are applied to touchable parts of the device including the antenna. This can be accomplished e.g. by
using cable ties and appropriate shortening of the cables.
For installation insert the SIM card correctly and tighten it by using the clamp of the card reader:
1. First open the clamp by shifting the slide in
the arrow’s direction (OPEN). After release
you can open the lid and insert the SIM card
as shown in the picture. Please note the posi-
tion of the bevelled edge: it must point at the
lower-right side. The golden contact pads
have to point downwards.
2. Insert the card until the lid can be closed as
shown in the picture. The slide must be mov-
able in this position. Please note the position
of the bevelled edge. Now move the slide
against the arrow’s direction until it clicks into
place and the lid is locked. The SIM card is
now ready to use.
3. After that connect the antenna to the UniMod GSM-3 using the FME plug. At last (important!) con-
nect it to the supplying power.
