66250754-EN - V1.0 - 18/02/19
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4000 Series GSM Audio Intercom - Technical Manual
4000 Series GSM Audio Intercom with Proximity
RS485 Network Connection
ART. 4903 NETWORK CONNECTION USING RS485
As mentioned previously, refer to Fig.16 on page 16, the Art.4903 keypad can be connected via the RS485 bus terminals to the
Art.4810 GSM PRO module allowing additional features of the GSM PRO to become available, which include:
• the capacity to store up to 400 permanent access codes (000 - 399);
• assign any of the 400 access codes to an access level (0 - 9);
• the capacity to store up to 32 temporary access codes;
• allocate any of the 32 temporary codes to a specic time period (between 1 - 255 hours) after which time the code will be
deleted;
• assign any of the access codes, whether permanent or temporary, to trigger either of or both of the relays (RLY1 and/or
RLY2).
Not only does the RS485 connection allow the Art.4903 keypad to be connected to the GSM PRO intercom, but also allows it to be
networked with other Art.4903 keypads up to a total of 8 devices with each device setup with a unit ID (1 - 8). This feature also means
that the networked keypads can have a permanent connection to a PC with the inclusion of an Art.481 (RS485 to USB converter),
see Fig.41 on page 28, the advantage of which is that the keypads can be programmed directly using the GSMSK PC software and
if required monitored for events (refer to technical manual: GSMSK_66251720_EN_V2-0 or later for more information).
ART. 4850R NETWORK CONNECTION USING RS485
Like the Art.4903 keypad the Art.4850R expansion reader can also be connected to the GSM PRO intercom via the RS485 terminals
(up to a total of 8 devices, 7 readers with the GSM PRO’s onboard reader as device ID.1) and each setup with a unit ID (1 - 8). As
before this feature allows the additional proximity readers to be permanently connected to a PC with the inclusion of an Art.481
(RS485 to USB converter), see Fig.42 on page 29.
The proximity readers operate as expansion readers only so the maximum capacity of proximity fobs/cards stored on the GSM PRO
intercom is still only 1000 (000 - 999) fobs/cards.
IMPORTANT NOTE: Both the Art.4903 keypad and the Art.4850R proximity reader can be networked together with the GSM
PRO provided that the overall number of devices on the RS485 bus does not exceed a total of 8 devices (excluding the Art.481
converter). All devices on the RS485 bus must have a unique unit ID setup including the GSM PRO intercom, see Fig.40 below.
It should also be noted that programming of the additional features for both the keypad and expansion reader can also be carried
out by sending SMS text messages to the GSM PRO intercom (refer to the notes programming the GSM intercom on pages 37 - 61).
Art.4810
Art.4903
To Antenna
RS485 bus
termination
jumper in
OFF position
UNIT ID.2
UNIT ID.1
OFFON
RS485 BUS TERMINATION
MOV
NO1 NC1
NO2 NC2
Art.4903
RS485 bus
termination
jumper in OPEN
position (set to
CLOSED position
when end of line)
Art.4850R
UNIT ID.3
485 / 232
RS-485
USB-PC
A B GND
RS-232
Art. 481
USB-Serial Converter
Open
Close
BUS
Termination
RS485 bus
termination
jumper in
CLOSED position
switch to RS485 position
USB cable
RS485 bus wires and common GND wire.
Networked Art.4850R readers and Art.4903 keypads
(UNIT ID’s 4, 5, 6, 7 and 8)
For more information on
cable requirements refer to
notes: general directions
for installation on page 30
RS485 bus cable
(2 core twisted or CAT-5 where: 1 core = A, 1 core = B, 1 pair = 0V/GND)
Fig. 40
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