Server Properties Configuration
Flow Control
The Flow Control setting must match the requirements of the serial device connected.
Note:
Select None when setting the port as
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
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Server Properties Configuration
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.
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