B&B Electronics Vlinx Serial Servers ESP902E - Manual (Page 23)

Server Properties Configuration
Manual Documentation Number: ESP901-902-3704 Chapter 5 35
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Flow Control
The Flow Control setting must match the requirements of the serial
device connected.
N N o o t t e e : :
Select None when setting the port as RS-485 or 4-wire RS-422.
TCP/UDP Protocol
Select TCP (Transmission Control Protocol) or UDP (User Datagram
Protocol) protocol. If the application does not require a UDP
connection, select TCP. TCP guarantees reliable communication with
error checking whereas UDP provides faster transmission.
UDP Mode
When UDP mode is chosen the Serial timeout , TCP alive timeout ,
Connection mode , Connection at , Max connection and
Remote IP address fields are replaced with the following
four fields: Destination IP address range , Port number and
Source IP address range . In this mode the server can be
configured to broadcast data to and receive data from multiple
IP addresses. Four IP address range fields are provided.
Figure 32. The Server UDP Configuration Screen
Serial Timeout
Default for the Timeout property is 0, or no timeout. Setting Timeout
to any value between 1 and 65535 seconds activates it. If Timeout is
set to 5 seconds and the Serial Server is configured as a Server , the
Client makes a connection and communications starts. If
Server Properties Configuration
36 Chapter 5 Manual Documentation Number: ESP901-902-3704
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104 – www.bb-elec.com
B&B Electronics Ltd – Westlink Commercial Pk – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445 – www.bb-europe.com
communications are ideal for 5 seconds the Serial Server will reset and
make itself available for another client connection.
TCP Alive Timeout
The Serial Server monitors TCP activity. If TCP activity stops for the
length of time specified in this field the connection will be closed. This
field can be set to any value between 0 and 255 minutes. If zero, or no
value, is entered into this field the server will not disconnect.
Connection Mode
The Connection Mode field has three options: Server , Client and
Client (no heartbeat). When Client or Client (no heartbeat) is
selected the Connection at field automatically becomes active
(allowing the user to select Power up or Data Arrival) .
• When using the Virtual COM Port feature, select Server.
• When using a TCP or UDP Socket program, select Server .
• When using Paired Mode communication between two serial
servers set up one as a Client and the other as a Server .
• When connecting to a server that does not support Heartbeat ,
select Client (no Heartbeat).
Delimiter HEX 1 and Delimiter HEX 2
These fields allow the user to enter two ASCII characters (in hex
format) that delimit the beginning and end of a message. When a
message with both these delimiters is received at the serial port, the
data contained in the serial buffer is placed in an Ethernet packet and
sent out the Ethernet port. If only Delimiter 1 is set (Delimiter 2 is zero
or blank), upon receiving Delimiter 1 the ESP901/902 will put all the
data in the serial buffer in an Ethernet packet and send it out the
Ethernet port. If serial data greater than 1 kilobyte is received it will
automatically be placed in an Ethernet packet and sent out the Ethernet
port .
Force Transmit
This field allows the user to set a maximum time limit between
transmissions of data. The value set in this field multiplied by 100 ms
determines the Force Transmit time. When the elapsed time reaches the
time configured in this field, the TCP/IP protocol will pack the data
currently in the serial buffer into a packet and send it out the Ethernet
port.