ZyWAN User Manual
Configuring the ZyWAN
© 2008 Arcom Issue D
90
Field/Option
Explanation
Echo Cancel RS-
485
This option is used when the internal (COM3) or an external RS-
485 converter is used in half-duplex mode. Set this option to
Yes
to block the reception of echo bytes on the serial port which get
echoed back from the RS-485 device.
Print Server
This option is used when the Terminal Server is used as a print
server to a serial printer. Setting this option to
Yes
causes the
Terminal Server to operate in
Print Server
mode. The Terminal
Server absorbs as much IP data as it can within the available
memory and send data to the serial port until it is all delivered,
regardless of whether the host disconnects. When this option is
set to
No
(default mode), if a host disconnects and data is still in
the Terminal Server buffer, the data is discarded and not sent to
the serial port.
Number of Servers
Enter the number of simultaneous clients which can connect to
this Terminal Server simultaneously. Values must be between 1
and 8. If this is set to 1, the Terminal Server is
preemptive
-- this
means that if a second client connects to the port, an already-
connected client is disconnected. With
Number of Servers
greater than 2, any further connections are blocked when the
number of simultaneous connections have been made.
Password
Enter a non-blank field as a password for the Terminal Server, if
desired. The password must be no longer than 15 characters.
When this is set, making a connection to the Terminal Server
port returns a prompt for ‘Password’. If the correct password
(case-sensitive) is not entered within a minute, the connection is
dropped.
Buffer Size
Enter the maximum number of bytes (between 1 and 4095)
which are allowed in a response to a network client. (The actual
number of bytes sent may be less if the
Demark
timer times out
before the serial buffer is full.)
Demark Timer
Enter the maximum time (in milliseconds, between 10 and
30000) the ZyWAN waits for inactivity on the serial port before
sending a response to the network client, if at least one byte has
been received.
Response Timeout
This option only applies if the Duplex option is set to
Half
Duplex
. Otherwise, this field is ignored.
Enter the
Response Timeout
(in milliseconds, between 10 and
30000). For simple request-response networks (half-duplex), the
request from a network client is sent to the serial port. If no serial
response is received within the
Response Timeout
, the Terminal
Server does not read any more serial data until the next request
and the serial port is released.
