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GSM modem
The RCU contains a GSM modem that can be used for sen-
ding and receiving SMS messages, and to access the RCU's
web pages.
Antenna
The RCU is delivered with an antenna, that is initially kept
rolled up inside the outer casing. If reception at the instal-
lation site is poor, try moving the antenna outside the box.
The antenna section has a piece of self-adhesive tape that
can be used to secure the antenna, for example to a win-
dow.
SIM card
The modem requires a 3.3-V SIM card. See the illustration
below for installation instructions. The SIM card must be
configured so that a PIN code is not used to obtain connec-
tion. This can be done in a mobile telephone or by the ser-
vice provider. For a telephonic data connection to the RCU,
the SIM card needs to have a special telephone number for
computer communication. Refer to the section "Web inter-
face – Settings" > "Modem" for further information.
If a cash card is used, remember to refill it at regular inter-
vals so that communication is not cut off by the operator.
1
2
Status
Serial Link
Activity
Link
3
2
1
Digital inputs
The RCU has two digital inputs (7) (optically isolated) for
connection of an external signal. The inputs shall be 10
– 24 VDC for an active high signal and 0 – 2 VDC for an
inactive signal.
terminal number
24
23
22
21
20
14
13
7
RCU 11
Installation
Function
Voltage feed
12 VDC
Signal ground
GND
Digital input common
Common
Digital In 1+
DI 1+
Digital ln 2+
DI 2+
Line A
RS-485
Line B
RS-485
4
5
Status
Serial Link
4
Activity
Link
7
11
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