PART 2: SOFTWARE CONFIGURATION
95
110150-4002A
FIELD/OPTION
EXPLANATION
Modbus Mode
Select the mode of operation, if Modbus protocol translation is required.
Modbus protocol translation is only needed if the network client is sending
Open Modbus/IP
protocol requests. Translation is not needed for other
types of data or if the standard serial Modbus (ASCII or RTU) is
encapsulated within the TCP/IP requests. Options available are:
None
: This is the normal option for most applications.
Open Modbus to ASCII
: Converts Open Modbus/IP protocol requests to
serial Modbus ASCII protocol, and converts the ASCII response to an Open
Modbus/IP response.
Open Modbus to RTU
: Converts Open Modbus/IP protocol requests to
serial Modbus RTU (Binary) protocol, and converts the RTU response to an
Open Modbus/IP response.
Serial Driver
Select whether to use the Native Linux (ttyS) serial driver or the ACSCOMM
driver. The ACSCOMM allows for half-duplex RS-485 communication and
can provide somewhat better handling of hardware flow control if required.
Broadcast Only
Select
Yes
to only send to the serial port. This option allows the network
computer to send data to the serial port without waiting for a response. The
Response Timeout
and
Duplex
mode are ignored.
Demark IP Packets
If a large network packet is sent to the ZyWAN-G9 and gets broken up over
the network, the fragments can sometimes arrive at slightly different times.
Each packet is sent to the serial port, but if the time difference is too great,
the serial device may not react properly. Set this value to
Yes
to allow
delayed IP packets to be put together before sending to the serial port. The
value for
Demark Timer
is used to specify the time to wait for additional IP
data. Set this value to
No
if this feature is not needed.
Echo Cancel RS-485
This option is used when the internal (COM4) 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 sends 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 remaining data is discarded and will
not be 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 pre-emptive. This means that if a
second client connects to the port, an already-connected client is
disconnected.
With
Number of Servers
set to 2 or greater, 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-G9 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.
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