Installation Guide

2.4 GHz Wireless Data Transceivers
LIG0002AC Rev G
RS232 Pin Assignments (DB-9)
Pin Assignment Signal Definition
1 CD Carrier
Detect
Output Used to show an RF connection between transceivers.
2 TX Transmit
Data
Output Used to transmit data bits serially from the transceivers to the
system device.
3 RX Receive
Data
Input Used to receive data bits serially from the system device
connected to the transceivers.
4 DTR Data
Terminal
Ready
Input Used only in transceivers in Point-to-Point Slave/Master
switchable mode or for DTR Connect.
5 GND Ground Signal return for all signal lines shared with Pin 9.
6 DSR Data Set
Ready
Output Always high when the transceiver is powered from the 2.5 mm
power connector. Indicates power is on to the transceiver. Also,
this pin can be used for +12.0 Volts when powering the
transceivers directly through the RS232 port.
Note: This is not used on the OEM module.
7 RTS Request to
Send
Input The transceiver does not recognize RTS for flow control. RTS is
used as a control line in RTS/CTS mode.
8 CTS Clear to
Send
Output This signal is used to tell the system device connected to the
transceiver that the transceiver is ready to receive data. When
asserted, the transceiver accepts data, when de-asserted the
transceiver does not accept data. This should always be used for
data rates above 38.4KB or a risk of lost data may occur if an RF
link is not very robust.
9 GND Ground Signal return for all signal lines shared with Pin 5.
RS422 and RS485 Full Duplex Pinouts
Function Bare Board Pin Number DB-9 Pin Number
RX+ 7 3
RX- 9 7
TX+ 5 2
TX- 10 8
Signal Ground 4 or 6 5
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