Chapter 2 Installation
MX-2100/2104
Installation and Operation Manual
2-10
Equipment Needed
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 (multidrop operation), the DCD line is
switched ON (active) when data is detected on the RD line, provided
MX-2100 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_DEL parameter).
Ring Indication (RI)
The RI line is used only with dial-up modems (DTE interface mode).
The RI line is normally OFF (inactive); when the modem attached to the MX-2100
SP connector detects an incoming call, the RI line is switched ON (active). See also
the DSR line.
Data Set Ready (DSR)
•
Usually, the DSR line is configured to track the DTR line. In this case, if the
supervisory port interface is DTE, the DSR line will be switched 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, MX-2100 always switches the DSR line OFF (inactive) for 5
seconds when the EXIT command is executed, and when the disconnect
time-out expires.
AUTOBAUD Function
When the AUTOBAUD function is enabled, MX-2100 can identify the rate of
incoming data by analyzing the timing of three consecutive pairs of Carriage
Return and Line Feed characters (generated by pressing three times the carriage
return key). The detected data rate is then used for the current communication
session. The automatic baud rate identification procedure is performed (or
repeated) whenever three consecutive carriage returns are received after one of
the following events occurs:
•
The DTR line has been switched OFF
•
The EXIT command has been executed
•
The idle disconnect time-out expired because no data has been exchanged
with the supervision terminal.
In case one of these events occurred, MX-2100 assumes that the current
communication session has been terminated. Therefore, when the password
protection is enabled the password must be entered again before the supervision
terminal can resume communication with MX-2100.
