InGateway Documentation, Release 0.0.1
• Stop Bit: specifies the last bit of a packet. Typical values are 1, 1.5, and 2.
• Software Flow Control: enables or disables software flow control on the serial port. It is a mechanism
to block flows when communication fails for some reason. This mechanism enables a data receiving
device to instruct the sender to stop sending data when it cannot receive data.
• Description: specifies the description of the serial port.
Caution:
• Serial port settings on the IG902 must be the same as those on the terminals connected to it.
• DTU and GPS IP forwarding cannot be enabled at the same time.
4.5.1.2 DTU1
The parameters of DTU1 are described as follows:
• Enable: enables or disables DUT1.
• DTU Protocol: specifies the communication protocol used on DTU1. Options are Transparent, TCP
Server, RFC2217 Mode, IEC101 to 104, Modbus Bridge, and DC Protocol.
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Transparent and TCP Server: In transparent transmission mode, the IG902 acts as a client. In
TCP server mode, the IG902 acts as a server.
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RFC2217 Mode: removes the need to configure serial port settings.
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IEC101 to 104: provides similar functions to TCP. This mode is applicable to the electric power
industry.
• Transmit Protocol: specifies the transmission protocol used. Options are TCP and UDP.
• Connection Type: specifies the type of the TCP connection. Options are Long-lived and Short-lived.
–
Long-lived: indicates that the TCP client retains the TCP connection to the TCP server.
–
Short-lived: indicates that the TCP client terminates the TCP connection to the TCP server if
no data is transmitted over the connection within the idle timeout period.
• Keepalive Interval: specifies the interval at which the TCP client sends TCP keepalive packets after
establishing a connection to the TCP server. The valid value range is 1-3600, and the unit is second.
• Keepalive Retry: specifies the maximum number of TCP keepalive packet retransmissions. The device
retransmits TCP keepalive packets when a TCP keepalive probe times out. If the device does not
receive any response after retransmitting TCP keepalive packets for the specified number of times, it
initiates a TCP connection again. The valid value range is 1-100.
• Serial Buffer Frame: specifies the buffer size on the serial port. The default value is 4K.
1.2. InGateway902 User Manual
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