Unit installation

Installation and Operation Manual Chapter 1 Introduction
FCD-E1 Functional Description 1-21
When the RTS line is OFF (inactive), the FCD-E1 interprets any data received from
the terminal on the TD line as MARK.
Clear to Send (CTS)
The state of the CTS line is determined by the CTS parameter:
ON The CTS line is always ON (active).
=RTS The CTS line follows the RTS line.
Data Carrier Detect (DCD)
The state of the DCD line depends on the communication address (node number):
• When the node address is 0, the DCD line is always ON (active).
• When a non-zero node address is used, the DCD line becomes ON (active)
when data is detected on the RD line, provided the FCD-E1 recognizes its own
address in the data stream.
To simulate DTE operation, the delay between these events can be set by the user
(by means of the DCD-DELAY parameter).
Data Set Ready (DSR)
• Usually, the DSR line is configured to follow the DTR line. In this case, if the
supervisory port interface is DTE, the DSR line will be set to ON for 5 seconds
when the RI line is ON while the DTR line is OFF.
• If the supervisory port interface is DCE, the DSR line can also be configured to
be continuously ON. However, if the DTR line switches to OFF, the DSR line
will also switch to OFF for 5 seconds.
In addition, the FCD-E1 always sets DSR OFF (inactive) for 5 seconds when the
EXIT command is executed, or the disconnect time-out expires.
Handshaking Protocol with Dial-up Modem
The dial-out mode in the FCD-E1 is supported by both the CONTROL DTE port
and CONTROL DCE port (the latter only when using a DCE/DTE cross-cable).
The handshaking procedure between the FCD-E1 and a dial-up modem uses the
control signals in the CONTROL DTE/CONTROL DCE connector. The procedure
is essentially similar to the handshaking with a terminal, except the directions of
the control signals are reversed relative to their direction in the CONTROL DCE
connector.
The control lines and the direction of the control signals in the CONTROL DCE
and CONTROL DTE connectors are detailed in the following chart.