User's Manual

FreeWave Technologies Spread Spectrum Transceiver User Manual

900 MHz and 2.4 GHz

V5.0S

RS232 Pin Assignments

Definitions:

Pin 1: Carrier Detect (CD) Used to show that there is an RF connection

between modems.

Pin 2: Transmit Data (TX) This is used to transmit data bits serially

from the modem to the system device

connected to the modem.

Pin 3: Receive Data (RX) This is used to receive data bits serially from

the system device to the modem device

connected to the modem.

Pin 4: Data Terminal Ready (DTR) The modem only uses this line in Point-to-

Point Slave/Master switchable mode (refer to

Operation Mode Selections) or for DTR

Connect (refer to Multipoint Operation).

Pin 5: Ground (GND) Signal return for all signal lines shared with

Pin 9.

Pin 6: Data Set Ready (DSR) Always high when the radio is powered from

the 2.5mm power connector. Indicated

power is on to the radio. Also, this pin can

be used for +12Volts when powering the

modem directly through the RS-232 port.

Note: This is not used on the OEM module.

Pin 7: Request to Send (RTS) The modem does not recognize RTS for flow

control. RTS is used as a control line in

RTS/CTS mode (refer to Radio

Transmission Parameters).

Table 17: RS232 Pin

Assignments

Pin Assignment Signal

1 Carrier Detect Output

2 Transmit Data Output

3 Receive Data Input

4 DTR Input

5 Ground

6 Data Set Ready Output

7 RTS Input

8 Clear to Send Output

9 Ground