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4.3.4.A Serial Communication (continued)
Transceiver:
The iServer’s DB9 serial port can either be set to
RS232
or two-wire
RS485
(default is
RS232
).
Modbus/TCP:
A widely used protocol mainly in industrial automation applications with
default TCP port number of 502 (see Local Port field). The options are
Enable
and
Disable
.
If
enabled
, the Modbus/TCP is the only protocol driven by the iServer on its LAN port. If
disabled
, the TCP/IP is the only protocol driven by the iServer on its LAN port (default is
disable
).
End Character:
When the defined Hex character is received by the iServer on its serial
port, the iServer will forward the buffered serial data to the Ethernet.
The default value is
00
, which forces the iServer to forward the data to the Ethernet as it
receives the data on its serial port (this means that the iServer requires NO “end
character” to forward the data).
Forward End Char:
The options are
Enable
and
Disable
.
If
enabled
, the iServer will send the End Character out to the Ethernet as part of the
data. If
disabled
, the iServer will not count the End Character as part of the data and
will drop it (default is enabled.)
Timeout:
In RS232 connection, if the iServer does not receive any more serial data
within the given time value, the iServer will forward the buffered serial data to the
Ethernet.
For example: if the Timeout is set to 200 ms, the iServer will send out the buffered
serial data to the LAN, if it does not receive any more data on its serial port for a period
of 200 ms.
In RS485 connection, the Timeout value is used to switch between serial transmit and
receive mode. Since the iServer supports 2-wire RS485, it needs to either transmit or
receive serial data and the Timeout value determines the time interval for each.
The range can be from 0 to 9999 ms (default is 0 ms).
Serial Port Password:
The options are
Enable
and
Disable
.
The Telnet connection to the iServer’s serial port (default port 2000) can be password
protected if this option is enabled (default is
disable
).
If
enabled
, the actual password can be placed in the next field.
4.3.4.B Terminal Server
TCP/UDP:
The iServer supports
TCP
and
UDP
protocol (default is
TCP
). If
UDP
is
selected, it can be configured either for Broadcast UDP or Directed UDP.
In case of Broadcast UDP, the iServer will transmit the serial data to every node on the
network. This can be accomplished if the Remote IP Address is set to
255.255.255.255
.
The Broadcast UDP is a practical solution when one device needs to communicate
with multiple PC’s or devices over the network (one-to-many connection).
In the case of directed UDP, the iServer will transmit the serial data to a specific node
on the network (one-to-one connection). This can be accomplished if the Remote IP
Address is set to the IP address of that specific node.
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