INTRODUCTION
The ZRC-20 is a data transceiver which can be operated both indoors and
outdoors. It transmits and receives data on frequencies in the license- free 2.4 GHz
Industrial, Scientific, and Medical (ISM) frequency band. Data rates up to 115Kb/s can
be supported. It is designed to be built into a wide variety of application devices
requiring data communication up to several miles.
Several ZRC-20 transceivers can be configured into a wireless network with some
functioning as relays. The transceiver uses frequency hopping spread spectrum
technology to mitigate interference.
OPERATION
The physical interface to the transceiver is through a 12-pin header. The
transceiver is powered and data is sent to and from the transceiver through this header.
The transceiver is powered from a 5-volt regulated supply capable of handling 1 amp
supply current. The signals available at this connector are TTL level compatible signals.
The signaling format is the same as RS-232 so only level conversion is required to
connect the transceiver to a RS-232 compatible device. The signals and their
corresponding actions are listed in TABLE 1.
TABLE 1. Interface Connector Pin Functions
Pin
Name
Designation
Signal Function Direction
1
Transmitted Data
TxD
Data
To DCE
2
Clear to Send
CTS
Control
From DCE
3
Data Set Ready
DSR
Control
From DCE
4
Data Carrier Detect
DCD
Control
From DCE
5
Ring Indicator
RI
Control
From DCE
6
Received Data
RxD
Data
From DCE
7
Request to Send
RTS
Control
To DCE
8
Data Terminal
Ready
DTR
Control
To DCE
9
+5 volts dc
Power Supply
10
Ground
Power Supply
11
Datagram
Control
To DCE
12
No Connect
