User's Manual

TS4000 Radio Modem User’s Manual Serial Port 12
connecting the TS4000 to other serial devices. For most serial devices this is not
a problem because RI is a modem (DCE) output and the TS4000 power supply
mostly falls within the allowed voltage range for RS-232 signals. Therefore the
power voltage on this pin is interpreted as an active RI signal. For systems that
use the RI signal differently, or cannot operate with power on this pin, this pin
should be disconnected between the TS4000 and the host equipment.
Alternate Connection: RI Connected to DSR
As an alternative, the RI pin can be connected to the internal DSR output signal.
The DSR (Data Set Ready) pin is pin 6 of a standard 9 pin subminiature D
connector and is an output for DCEs (the TS4000). For the TS4000, the DSR pin
is normally connected to the internal DSR output signal.
Alternate Connection: DSR Always High
As an alternative, the DSR pin can be set to always be in the active high state. In
this case it is internally connected to +5 volts through a 1 K
ohm
resistor.
The DTR (Data Terminal Ready) pin is pin 4 of a standard 9 pin subminiature D
connector and is an input for DCEs (the TS4000). For the TS4000, the DTR pin
is normally connected to the internal DTR input signal.
Alternate Connection: DTR for Modem Power
As an alternative, the DTR pin can be connected as a power pin into the TS4000.
Caution: The use of the DTR pin for power is non-standard. Therefore the
TS4000 serial port must not be connected to a standard serial device that
drives the DTR pin (i.e. a PC). This results in the power supply voltage of the
TS4000 being shorted to the DTR output of the host serial port, which could
damage to the host device. Therefore, when connecting the TS4000 to a PC for
configuration, make sure that the cable does not have a DTR (pin 4) connection.
The serial port provides a number of configuration options that allows it to be
connected to virtually any asynchronous host equipment. These configuration
options are set using the Serial Port tab of the Modem Configuration.
DSR Pin Signal Options
DTR Pin Signal Options
Configuration
Options