ZyWAN User Manual
Configuring the ZyWAN
© 2008 Arcom Issue D
83
Field/Option
Explanation
DTR Indicates
Connect State
Specify whether DTR indicates the IP connection state. If set to
Yes
, the serial port’s DTR output is asserted to a positive
voltage when the IP connection is established, and is de-
asserted when the IP connection is lost. This is meant to
operate similar to a Carrier Detect (CD) output from a dial
modem, which is asserted after a data connection is
established.
Buffer Size
Enter the maximum number of data bytes (between 1 and
4095) which are allowed in an IP packet. The actual amount
may be less if the
Demark Timer
(below) times out before the
serial buffer is full. This
Buffer Size
works both ways –network
originated packets are sent to the serial port in blocks of bytes,
and data coming in the serial port are broken into network
packets of the configured number of bytes.
Demark Timer
Enter the maximum time (in milliseconds, between 10 and
30000) the ZyWAN waits for non-activity on the serial port
before sending whatever serial data has been received.
Reconnect Delay
Enter the length of time (in seconds, between 1 and 65535) the
Terminal Client waits before attempting to reestablish a lost
connection with the server, if the connection has been dropped
for any reason. This option only applies when the
Connect
Mode
is set to
Continuously
.
Connect Mode
Choose the connection mode. The options available are:
Continuously
: Connect automatically upon system restart, or
upon either device dropping the IP connection. There must be
only one Host Connection row, with its
Matching Dial String
set
to an empty field.
Any Data
: Connect only when data is received from a serial
device connected to the COM Port. There must be only one
Host Connection row, with its
Matching Dial String
set to an
empty field.
ATDT String
: Connect only if an
ATDT###
message is received
on the serial port, where
###
is some alphanumeric string.
There may be many Host Connection rows configured under
this Terminal Client, with their
Dial String
set to unique
ATDT###
values.
This acts as a modem emulator, whereby each ATDT dial
sequence initiates a connection to an IP address. Until a
matching dial string is received, the ZyWAN does not make an
outbound Terminal Client connection. See
Matching Dial String
(below) for more details.
Use DCD Pin
: Connect if the Data Carrier Detect (DCD) input
signal on the serial port is raised to a positive RS-232 voltage.
This must be used with an RS-232 port, and does not apply
