Moxa Technologies NPort 5600 Local TCP port, Setting Factory Default Necessity 4001 Required

NPort 5600 Series User’s Manual		Configuring NPort Administrator
	Force transmit
	Setting	Factory Default	Necessity
	0 to 65535 ms	0 ms	Optional
	0: Disable the force transmit timeout.

1 to 65535: Forces the NPort’s TCP/IP protocol software to try to pack serial data received during the specified time into the same data frame.

This parameter defines the time interval during which NPort fetches the serial data from its internal buffer. If data is incoming through the serial port, NPort stores the data in the internal buffer. NPort transmits data stored in the buffer via TCP/IP, but only if the internal buffer is full or if the Force transmit time interval reaches the time specified under Force transmit timeout.

The optimal Force transmit timeout depends on your application, but it must be at least larger than one character interval within the specified baudrate. For example, assume that the serial port is set to 1200 bps, 8 data bits, 1 stop bit, and none for parity. In this case, the total number of bits needed to send a character is 10 bits, and the time required to transfer one character is

( 10 (bits) / 1200 (bits/s) ) * 1000 (ms/s) = 8.3 ms.

Therefore, you should set Force transmit timeout to be larger than 8.3 ms, so in this case, it must be greater than or equal to 10 ms.

If the user wants to send the series of characters in the same packet, the serial device attached to NPort should send that series of characters during a time interval less than the Force Transmit timeout for NPort, and the total length of data must be less than or equal to NPort’s internal buffer size. The serial communication buffer size for NPort is 1 KB per port.

Local TCP port

Setting	Factory Default	Necessity
1 to 65535	4001	Required

The “Local TCP port” is the TCP port that NPort uses to listen to connections, and that other devices must use to contact NPort. To avoid conflicts with well known TCP ports, the default is set to 4001.

Command port

Setting	Factory Default	Necessity
1 to 65535	966	Optional

The “Command port” is a listen TCP port for IP-Serial Lib commands from the host. In order to prevent a TCP port conflict with other applications, the user can set the Command port to another port if needed. IP-Serial Lib will automatically check the Command Port on NPort so that the user does not need to configure the program.

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