МBET-3 begins operation immediately after power-up. After
initialization (about 2s), MBET-3 enters “Command
mode” /checks for connection time/. MBET-3 can act
as a client or as a server. If MBET-3 is set as a client,
the connection with servers is initiated by the device,
i.e. MBET-3 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-3 to be able
to connect to them. MBET-3 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-3 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-3 starts
with identification data packet to identify the remote reading
network, connected to this particular MBET-3. 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-3 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-3 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-3 is set as a server, it just waits for remote
connections on specified port. After connection request
arrives, MBET-3 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-3
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-485/RS-232 port, and after
successful connection all the parameters can be set remotely
by the server, if needed.
All the connectors of MBЕТ-3 are on industrial terminal blocks except
LAN connector, which is standard RJ-45 plug. Mounting should be made by qualified
technicians and is on standard M-35 DIN-rail.
