Special
notes for the A733GSM/GPRS RTU
Set/configure the following parameters through a terminal connection to enable
GPRS connection to your ISP:
GPRSAPNSERV “[servername]”
where [servername] is the name of the ISP's
GPRS access server (required)
GPRSAPNUN “[username]”
where [username] is the name of the GPRS
user’s name for the ISP (might be optional)
GPRSAPNPW “[password]”
where [password] is the password for the
GPRS user (might be optional)
The following examples show the GRPS parameters for an Austrian mobile phone
services provider:
GPRSAPNSERV
“A1.net”
GPRSAPNUN
GPRSAPNPW
“ppp”
Note:
Please take extreme care not to misspell the GPRS-parameter values, and not to
switch the case of letters. Misspelled names/entries could cause the RTU not to
connect to the GPRS network or A840.
Configuring the TCP Parameters
The A733 GSM/GPRS RTU will only connect to the A840 Telemetry Gateway if the
following TCP Parameters are set:
GPRSHOST “[a840-ipaddress]”
where [a840-ipaddress] is the IP address
of the A840 Telemetry Gateway the RTU
has to connect to. For RTUs with built-in
Motorola GSM/GPRS modules, this
parameter must be an IP address in
decimal dotted notation, e.g.
123.45.23.45.
GPRSPORT [portnumber]
where [portnumber] is the port number
where the communication with the A840
Telemetry Gateway will occur. If this
parameter is set to 0, the RTU will
operate only in GSM mode.
GPRSDNS1 [dotted_dns_address]
(optional) first DNS server address of
your GPRS network operator (e.g.
123.34.2.34). This and the next command
are not available on RTUs with built-in
Motorola GSM/GPRS modules.
GPRSDNS2 [dotted_dns_address]
(optional) second DNS server address.
Note:
When using an Internet Firewall in front of the LAN where the A840 Telemetry
Gateway resides, be careful to properly configure the firewall and the
A733GSM/GPRS RTU connection parameters
[a840-ipaddress]
and
[portnumber]
. This is particularly important if you use NAT (network address
translation) on your firewall.
C
AUTION
:
If you are using an Internet Firewall in front of your A840 Telemetry Gateway, allow
connection to devices only with IP addresses from your GPRS network operator’s
IP networks to your A840 Telemetry Gateway. When your GPRS network operator
changes the addresses of his IP networks, you must adjust your firewall’s filters
appropriately.
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