MBET-2WR is powered by external adapter 6-9 Vac/200 mA
or 5-12 Vdc/200mA. The central pin of the power connector
is 2mm thick. We recommend adapter with power rating 6-12
Vdc/5W. Power supply voltage should not exceed 20 Vdc/ 15
Vac.
МBET-2WR begins operation immediately after power-up. After
initialization (about 2s), MBET-2WR enters “Command
mode” /checks for connection time/. MBET-2WR can act
as a client or as a server. If MBET-2WR is set as a client,
the connection with servers is initiated by the device,
i.e. MBET-2WR can be connected in local network without
real static IP-address. All of the contacted servers must
have static real IP-addresses in order for MBET-2WR to be
able to connect to them. MBET-2WR can contact up to six
servers – two “control” operators and four “data”
operators. The two control servers can program all network
access settings and have no access to the transmitted data.
Likewise, the data operators can access only the data, but
cannot program any network parameters. If it is needed for
an operator to have access both to the network settings
and the data, its IP-address must be set both as control
and data operator. Accessible mediums for every data operator
may be programmed, so, for example, the operator which monitors
water consumption, cannot access the data, monitored by
gas supplier and vice-versa. MBET-2WR tries to connect to
the servers after predetermined period of time (default
1h). Each of the servers can accept or reject the incoming
connection. If the connection is accepted, MBET-2WR starts
with identification data packet to identify the remote reading
network, connected to this particular device. After identifying
the network server can reprogram network parameters (for
control operators) or access network data (data operators).
When all parameters are programmed or needed data is read,
server must send TCP packet for closing the connection.
After receiving this packet, MBET-2WR closes the connection
and tries to connect to the next server in the list until
all the servers in the list are contacted. If no close connection
packet is send or MBET-2WR cannot connect to the server,
it waits for predetermined period of time and closes the
connection, if no data exchange occur. This process is repeated
continuously, connection attempts are programmable period
of time.
If MBET-2WR is set as a server, it just waits for remote
connections on specified port. After connection request
arrives, MBET-2WR checks its internal IP list and if remote
IP and port number are valid - establishes connection. If
no communication occurs for predefined period of time, MBET-2WR
closes the connection automatically.
Initial parameters programming is essential and includes
setting the LAN/WAN-network parameters (IP-address, gateway
IP-address, network mask, IP-address of the control server,
etc, including setting new MAC-address if MAC-conflict occurs)
and remote reading network parameters (baud rate and parity
of serial connection, remote reading network number). These
parameters must be set first via RS-232 port, and after
successful connection all the parameters can be set remotely
by the server, if needed. Since device has DHCP on by default,
if the user has a router with enabled DHCP he can skip most
of the settings - IP address, Mask and Gateway will be set
automatically.
During normal work device tracks all three pulse inputs
simultaneously. Pulse input data is saved in non-volatile
memory. There is a remote server, host by Gineers, which
can be used for automated readings. The devices connects
every n-hour, data is saved and can be send via email to
particular user - every day, day of a week or day of a month.
The device memorizes only raw pulses. Additional info for
every input such as pulse constant, unit measures, initial
values, price-per-pulse, etc., are saved in a server database.
Through unique ID, that every MBET-2WR has, server knows
which device its talking to and calculate consumption properly.
Most of the connectors of MBЕТ-2 are at the back of the
device - these are Power supply, RS-232 port and LAN connector.
Three pulse inputs are on the opposite side, on a removable
terminal block. Ground is common for the three inputs. The
cable, connecting MBET-2WR to an m-bus converter type MBRS
(RS-232 RJ45-RJ45 cross) is part of the package. The cable
for initial programming (RS-232 DB9-RJ45 cross) is not delivered
with MBET-2WR as it is part of the package of every m-bus
converter type MBRS.
IP address of Gineers server is programmed in every MBET-2WR
in the fabric. Of course, client can re-write it, if he
does not want device to connect to remote Gineers server,
but to maintain his own server and database.
