Videx 4000 Series - USB & RS485 Connection to a PC

66250754-EN - V1.0 - 18/02/19
- 26 -
4000 Series GSM Audio Intercom - Technical Manual
4000 Series GSM Audio Intercom with Proximity
USB & RS485 Connection to a PC
CONNECTIONS TO A PC
The GSM PRO module includes two options for connecting to a PC: via a USB connection or via an RS485 connection. Both methods
of connection are to allow for ease of programming and monitoring using the GSMSK PC software.
IMPORTANT: WHEN A USB CONNECTION IS PLUGGED INTO THE GSM PRO THE RS485 CONNECTION IS DISABLED.
All programming features described in this manual are also accessible using the software. Further information on using the GSMSK
PC software can be found in the technical manual GSMSK_66251720_EN_V2-0 (or later version).
OPTION 1: USB CONNECTION
The GSM PRO module can be connected using a standard micro-USB to USB cable as shown in Fig.38. This method of connection
is primarily used for programming and setup of the GSM module only.
Art.4810
To Antenna
micro-USB to USB cable
PC
IMPORTANT NOTE:
The USB input is not intended for a
permanent connection to the PC and
should only be used for programming.
For a permanent connection refer to
OPTION 2, RS485 notes below.
Fig. 38
OPTION 2: RS485 CONNECTION
The GSM PRO module can also be connected using an RS485 bus connection via an RS485 to USB converter (Art.481) as shown
in Fig.39. This method of connection, like option 1, can be used for programming and setup of the GSM module, but can also be
used in instances where a permanent connection to a PC is required for monitoring purposes and downloading event logs. When
connected in this way the GSM module can only be connected as a ‘one-to-one’ bus connection to the PC, another GSM PRO
module cannot be connected on the same RS485 bus to the PC.
Art.4810
To Antenna
RS485 cable
485 / 232
RS-485
USB-PC
A B GND
RS-232
Art. 481
USB-Serial Converter
Open
Close
BUS
Termination
USB cable
switch to RS485 position
BUS
termination
jumper in
the closed
position
PC
Fig. 39
*For end of line termination a 120 Ohm resistor must be tted across the RS485 terminals A and B, as shown in Fig.39, but only if
the GSM PRO intercom is the last device in line.