7: Setup Mode: Channel Configuration
d) Datagram Type Directed UDP
When selecting this option, you are prompted for the Datagram type.
Enter 01 for directed or broadcast UDP. Datagrams of type 01 can be
sent as a broadcast by enabling the Send as Broadcast option. The
default is not to broadcast.
When the UDP option is in effect, the unit never attempts to initiate a
TCP connection because it uses UDP datagrams to send and receive
data.
In Modem (Emulation) Mode, the unit presents a modem interface to the a ttached
serial device. It accepts AT-style modem commands and handles the m odem signals
correctly.
Normally, there is a modem connected to a local PC and a modem connec ted to a
remote machine. A user must dial from the local PC to the remote mac hine,
accumulating phone charges for each connection. Modem Mode allo ws you to
replace modems with xPicos, and to use an Ethernet connection instead of a phone
call. By not having to change communications applications, you avoid pot entially
expensive phone calls.
To select Modem Mode, set the Connect Mode to C6 (no echo), D6 (echo with full
verbose), D7 (echo with numeric response), CF (modem responses onl y, numeric
response), or CE (modem responses only, full verbose).
Note: If the unit is in Modem Mode, and the serial port is idle, the unit can still acc ept
network TCP connections to the serial port if Connect Mode is set to C6 ( no ec ho ),
D6 (echo with full verbose), D7 (echo with numeric response, CF (modem res ponses
only, numeric response), or CE (modem responses only, full verbose).
Without Echo
In Modem Mode, echo refers to the echo of all of the characters
entered in command mode; it does not mean to echo data that is
transferred. Quiet Mode (without echo) refers to the modem not
sending an answer to the commands received (or displaying what
was typed).
Data Echo & Modem
Response
Full Verbose: The unit echoes modem commands and responds to
a command with a message string shown in the table below.
Numeric Response: The unit echoes modem commands and
responds to a command with a numeric response.
Modem Responses
Only
Full Verbose: The unit does not echo modem commands and
responds to a command with a message string shown in the table
below.
Numeric Response: The unit does not echo modem commands
and responds to a command with a numeric response.
Table 7-7. Modem Mode Messages
Message
Meaning
Full Verbose
OK
Command was executed without error.
CONNECT
A network connection has been established.
NO CARRIER
A network connection has been closed.
RING n.n.n.n.
A remote device, having IP address n.n.n.n, is connecting to this
device.
xPico User Guide 47