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4-18 VersaMax Serial to Ethernet Adapter User's Manual – July 2000 GFK-1852
4
Gateway IP Address
The router/gateway address is needed to communicate to other LAN segments. The
default gateway must be set to the IP address of the router that connects these
segments. This address must be within the local network.
Netmask
A netmask defines how many bits from the IP address are to be taken as the network
section and how many bits are to be taken as the host section (re class A: 8/24
(net/host), class B: 16/16, class C: 24/8 bits). If set to 0, the standard netmask for the
actual IP address is used. Appendix A covers the calculation of the right value in
detail.
The VMSE prompts for the number of host bits, and then calculates the netmask. It is
shown in standard format “255.255.xxx.xxx” when saved parameters are displayed.
Serial and Mode Settings
To change the Channel settings, press ‘2’. The following values can be set/changed:
Protocol, Serial Interface
Protocol
At the first prompt, select 1 for Save or 2 for Master. At the second prompt, select 1
for Modbus/RTU or 2 for Modbus/ASCII.
Serial Interface
Enter the interface setup as BBBB,D,P,S,RSxxx where BBBB is the baud rate
(default is 19200), D is the number of data bits , P is parity, S number of stop bits,
and RSxxx is 232 or 485 .
Modem Control Settings
To change the Modem settings, press ‘3’. The following value can be set/changed:
RTS Output