RF Neulink NL5000 Rev B0 - Manual (Page 9)

NL5000 User Manual Rev B0 8
Pin 9 TD (Transmit Data)
RS-232 data to be transmitted to the modem should be presented to this pin. The
data should be at normal RS-232 levels and are transmitted from the host
computer or other devices to the modem.
Pin 10 CTS (Clear to Send)
This RS-232 output pin is asserted by the modem as a response to an assertion of
the RTS pin when it is ready and able to receive data from the host computer or
device.
Pin 11 DSR (Data Set Ready)
This RS-232 output pin is asserted by the modem when it is powered-up. It
indicates that the modem is actually connected, although not necessarily ready to
receive data. The polarity (active low/active high) is programmable via the
Configuration Software.
Pin 13 CD (Carrier Detect)
This pin is asserted by the modem when the receiver has detected a carrier. The
RF level set point is set via the Configuration Software. Note that the modem
demodulation circuitry does not actually use this signal to determine that a valid
data packet has been received. The polarity (active low/active high) is
programmable via the Configuration Software
Pin 14 RTS (Request to Send)
This RS-232 input pin is asserted by the host computer or device to indicate that it
has data to be transmitted by the modem. If the modem is able to accept the data,
the CTS pin will be asserted in response.
Pin 15 GND (Ground)
The system ground common point and negative connection for the power
supply input.
3.2 INDICATORS
The NL5000 Modem has two indicators on the side of the unit, one green RX LED
and one red TX LED. They function as follows:
GREEN RX LED This indicator is illuminated when the modem has detected a
valid preamble for a data packet. This indicator reflects the behavior of the