American Fibertek CX-6p-PoE - Manual (Page 39)

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pin on each port will only be asserted when that port is connected to a destination that
can receive data, and the port will only transmit data when the CTS input pin is asserted.
With flow control set to ‘None’, the RTS pin will be asserted all the time and the CTS
input pin will be ignored.
Procedure to link serial ports on two Net I/O devices together
The serial port function of the CX-6p-PoE is intended to be used with two or more CX-
6p-PoE devices on a network, where a serial port on one CX-6p-PoE is linked to a serial
port on another CX-6p-PoE. The only restriction is that client and server ports must be
linked together in one-to-one pairings.
To link serial ports on two CX-6p-PoE devices, you must designate the port on one
device as the Slave, and one port on the other device as the Client. The Client port
must be configured with the IP address of the Server, and the port number of the port on
the server being connected to. The Server port may either be configured with the IP
address of the Client, or set to ‘0.0.0.0’.
It is recommended that both ports in a client-server pair be set to the same hardware
mode and the same baud rate. Setting different baud rates between the two ports is
permissible, but not recommended as characters may be dropped if data is coming in to
the higher speed port faster than they can be transmitted out of the lower speed port.
Baud rate and buffer size considerations
Each port has a buffer which stores data coming in from the serial port and stores it until
it can be transmitted over the network. Normally this data is sent out over the TCP/IP
connection as quickly as it is received. During conditions of heavy network activity or
high latency the buffer may become full. When this occurs some data may be lost.
Data coming from the remote unit over the TCP/TP connection will be sent out over the
local serial connection at the specified baud rate. If the remote unit is sending data at a
higher rate than the local baud rate permits transmission, data may be lost.