Overview
2.4 Addresses and Port Number
Hardware Address
The Ethernet address is also referred to as the hardware address or the MAC address. The first three bytes of
the Ethernet Address are fixed and read 00-20-4A, identifying the manufacturer of the product. The fourth,
fifth, and sixth bytes are unique numbers assigned to each unit.
00-20-4A-14-01-18 or 00:20:4A:14:01:18
Note: The MAC address is printed on the ID label.
IP Address
Every device connected to an IP network must have a unique IP address. This address is used to reference
the specific unit. The NET232 is automatically assigned an IP address on DHCP-enabled networks, as it is
DHCP-enabled by default. However, you must assign it a permanent IP address during the configuration
process.
Port Numbers
Every TCP connection and every UDP datagram is defined by a destination IP address and a port number.
The units serial channel (port) can be associated with a specific TCP/UDP port number. The default port
setting is 10001.
Port number 9999 is reserved for access to the unit's Setup (configuration) Mode window. For more
information on reserved port numbers, see Table 10 - Reserved Ports on page 3-21.
2.5 Serial RS232 Interface
The table below lists the RS232 signals for the NET232. The RS232 interface is a 9-pin D-style connector.
Male connectors are wired as DTE and female connectors are wired as DCE.
Table 1 - RS232 Signals
NET232 Signal Direction DTE DB-9 Male
Pin #
DCE DB-9
Female Pin #
Data Out (TXD) Out 3 2
Data In (RXD) In 2 3
Ground 5 5
RTS In 8 7
CTS Out 7 8
The NET232-DCE kit includes a 9-pin Male/Male Gender Changer if you need a male connector. The
NET232-DTE kit includes a 9-pin Female/Female Null Modem Adapter.
Note: RTS and CTS control lines are not enabled at the factory. See Configurable Pin Settings on page 3-13 and
Flow on page 3-21.
NET232/NETUSB User Guide 2-5
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