
DResearch – User Manual TeleObserver MR3180
2011-02-03
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2.4.6
COM 1 – Serial data transmission and GPS connection
The serial COM1 port (RS232) on the front of the recorder is used (as a service interface) for
maintenance of the device or for connecting external devices such as a GPS receiver or modem.
The interface (D-SUB 9, male) is configured as standard for RS232:
Interface
Pin
Name
Description
1
CD
Carrier Detect
2
RxD
Receive Data
3
TxD
Transmit Data
4
DTR
Data Terminal Ready
5
GND
System Ground
6
DSR
Data Set Ready
7
RTS
Request to Send
8
CTS
Clear to Send
(male)
9
RI
Ring Indicator
Pinout of interface COM 1
GPS receiver connection
Note that the only navigation systems and GPS receivers supported are those recommended by
DResearch. The GPS receiver can be connected directly to the COM1 port. The port parameters can
be configured in SystemManagement
GPS. (See Chapter 3, Configuration.)
Use as service interface
The service interface allows analysis of the device using a terminal. This should only be carried out by
authorised experts. This requires the use of a fully wired serial service cable from DResearch.
2.4.7
COM 2 Interface – External modem connection
An external modem for sending SMS messages can be connected via the COM2 (RS232) port. The
only modems which are supported are these ones available as accessory. A connected modem is
automatically recognised by the recorder. A SMS-capable software receiver must be installed on your
PC. This is not included in the shipment!
When operating a GSM modem for the first time the access to the relevant providers has to be
configured (PIN, AT commands etc.) before inserting the SIM card and connecting the modem to
the MR3180.
Incorrect operation can lead to the SIM card being blocked! DResearch takes no responsibility for
the costs associated with a blocked SIM card if the above instructions are ignored and the
equipment is operated improperly!
2.4.8
COM 3 and COM 4–Interface (IBIS and RS485)
Ports COM 3 and COM 4 (RS485) are used for connecting the IBIS-Bus (COM 3) and any external
RS485 devices (e.g. a GPS-receiver). Both ports lead out via the pins on the unit’s Ext. Device
external interface.