5 Installation
Page 5-4
gas-net
C1 and C2
5
GND
Signal ground
used for RK512/3964R and
MODBUS
6
DSR
Data set ready
--
7
RTS
Request to send
--
8
CTS
Clear to send
--
9 RI Ring
indicator
--
Screen
--
Chassis
has the same potential as the
protective ground
In case of a C2 device, the COM2 interface may be used for the connection of
the modem or null-modem cable for the functionality of the integrated RDT.
The connection of a wireless modem requires special attention and thus some
preparations that must be accomplished before you may actually commission
the device:
Provider Selection / Preparation for Antenna Selection
The first step is the selection of a suitable provider for the usage of the
wireless network, with consideration of area coverage and service rates. The
provider’s data service hast to use the RLP protocol for data backup. The
converter (gateway) of the provider has to offer an error protocol conversion
according to MNP4 and V42, respectively.
In order to be able to select the correct antenna, check the data signal qual-
ity on site; for instance, check the field strength by means of a normal mobile
phone.
Also check the installation possibilities for the antenna. Especially consider
the characteristics of the building. An external installation is always prefer-
able. Attention is to be paid to the station’s environment. In case of stations
located within built-up areas an antenna that can be protected against van-
dalism might be useful.
It is also important to measure the distance between antenna and modem to
be able to order the antenna cable in the required length.
Component Composition
As soon as you have finalized the contract with the provider you have to
apply for the data service. Furthermore, make sure that the data service will
be released by the scheduled commissioning date and that the chip card will
be available, too.
Select the antenna depending on the determined data signal quality and
preferably after consultation with Elster-Instromet Systems.
