Setting Up A Virtual Serial Port - Promax MO-180 Manual De Usuario

USER'S MANUAL MO-180
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IP mask. The subnet IP mask is used together with the IP address to
determine which part of the address is the network address and which part is
the modulator address. To do this a bitwise AND operation is performed. Thus
the 1's in the IP mask designate the part of the address as being part of the
network portion and the 0's mark the part as being part of the MO-180
address. For instance, with IP mask 255.255.255.0 we indicate that the first
24 bits are used as network address. The value programmed by default is
255.255.255.0. In an alternative form known as Classless Inter-Domain
Routing (CIDR) notation, the default IP address can be also represented as
192.168.29.5/24.
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Gateway IP. A gateway is a network node that transfers data between private
networks and other networks (e.g. the Internet), resolving which IP addresses
are part of the private network and which are not. This is the 4-byte IP address
of the gateway and should be only used if the modulator needs to have access
to the Internet or if it is going to be reached by other equipment outside the
private network. The default value is 0.0.0.0 which stands for NOT USED.
Dynamic addresses cannot be directly selected through the modualtor's menu.
To set up a dynamic address we have to choose a special IP address value with which
we explicitly indicate the dynamic address assignment method we want to use. For this
purpose, octets 1, 2 and 4 are all set to 0. Octet 3 controls whether we want to use
BootP, DHCP, AutoIP or a combination of the three. If the third octet is 0 then all three
methods are enabled at the same time. To disable any one of them we have to assert
the corresponding bit (bit 0 for AutoIP, bit 1 for DHCP and bit 2 for BootP). Thus, for
instance, if it is only DHCP that we want to enable (as it typically occurs in practice) the
IP address we have to programme into the modulator is 0.0.5.0.
It is not advisable to disable all dynamic address assignment methods (0.0.7.0)
since this would make the process of assigning a dynamic IP address to the MO-180
really difficult.

4.13.2 Setting up a virtual serial port

In this section we describe how to remotely access the MO-180 via a virtual
serial connection built over a real Ethernet connection. This involves configuring the
network client on the MO-180 (IP addresses and mask) and opening a serial
connection on the remote computer using the appropriate software tools.
As we explained in the previous section, the default IP addresses of the subnet
the MO-180 belongs to are within the range 192.168.29.x with mask 255.255.255.0. If
the MO-180 is connected to another network (e.g. the Internet) via a gateway, the IP
address of the gateway should be also specified.
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