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Chapter4 SI-65 Usage
4-1. SI-65 Overview and Features
SI-65 is a communication converter to convert asynchronous communications for
devices equipped with the RS-422/485 interface to TCP/IP communications on Ethernet
LAN. Since the converter supports both two-wire and four-wire full duplex, using the
device allows you to support various systems.
The following chart shows the internal structure of the converter.
Line Monitoring Function
RS-485 communications of two-wire half duplex is required to send data after
confirming that any devices have not sent data into the RS-485 line. The line monitoring
function allows to detect that any devices have not sent data into the RS-485 line, and
to conduct the flow control. To use this function, the flow control of built-in XPort is
required to set to CTS/RTS (Hardware).
RS-485 Line Condition
Flow Control Condition
The period of time from when to detect a space bit of the
data in the RS-485 line sent by another device, to when
not to get to continuously detect a space bit over internal
timer time of the converter, while the RS-485 driver of the
converter is not active.
Prohibits sending data
from the converter to
the RS-485 circuit.
The period of time when not to detect a space bit in the
RS-485 line which another device continuously sends over
internal timer time of the converter, or when the RS-485
driver of the converter is active.
Permits to send data
from the converter to
the RS-485 circuit.
Note: This function allows the flow control to operate in a direction of sending only.
The flow control in a direction of receiving does not operate.
