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NT Series Transceiver Command Data Interface
Reference Guide RG-00101
Introduction
The NT Series transceiver has a serial Command Data Interface (CDI)
that offers the option to configure and control the transceiver through
software instead of through hardware. This interface consists of a
standard UART with a serial command set. This allows the module to be
configured dynamically instead of hardwired, which enables applications
such as frequency hopping or listen before talk.
Connecting the Command Data Interface
The CDI uses five lines on the module (Figure 1). These are described
in Figure 2.
The CDI is activated by pulling the CMD_DATA_TYPE line low.
It uses Command Data In (CMD_DATA_IN) and Command Data Out
(CMD_DATA_OUT) as a serial port. The data format follows standard
UART conventions of 8 data bits, 1 start bit, 1 stop bit and no parity.
The UART voltage levels are mark (1) = V CC and space (0) = GND.
The Command Data Baud (CMD_DATA_BAUD) line sets the baud rate
of the serial interface to either 9,600bps (low) or 57,600bps (high).
The serial interface is available for use when the transceiver is not in
Power Down or Standby mode. The Ready output (READY) can be used
for simple hardware flow control similar to Clear To Send (CTS).
This output is logic low when the transceiver is able to receive command
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
GND
NC
GND
NC
NC
GND
NC
NC
TRPT/PKT
CHN_SEL0
GND
CHN_SEL1
CHN_SEL2
LVL_ADJ
READY
NC
GND
T/R_SEL
BAUD0
BAUD1
RSSI
GND
GND
ANTENNA
GND
NC
NC
GND
DATA_IN
DATA_OUT
NC
NC
GND
NC
NC
CMD_DATA_BAUD
CMD_DATA_TYPE
CMD_DATA_OUT
GND
CMD_DATA_IN
STANDBY
VCC
POWER_DOWN
GND
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
data. If READY is logic high, the transceiver cannot receive commands.
NT Series Transceiver Pin Descriptions
Figure 1: NT Series Transceiver Pinout (Top View)
Pin #
15
27
29
30
31
Name
READY
CMD_DATA_IN
CMD_DATA_OUT
CMD_DATA_TYPE
CMD_DATA_BAUD
Description
Ready. This line is low when the transceiver is ready to communicate and high when its busy. This
line can be used for hardware handshaking on the command port.
Command Data In. This line is the input for command data to set up the module or packet data to
be packetized and transmitted.
Command Data Out. This line outputs the command data responses when setting up the module or
packet data that has been received.
Command Data Type. This line sets the serial data as either command data or packet data. Pull low
for command data; pull high for packet data.
Command Data Baud. This line sets the baud rate of the command and packet data. Pull low for
9,600bps; pull high for 57,600bps. This line is checked once on power-up.
Figure 2: NT Series Transceiver Pin Descriptions
– 1 –
Revised 4/25/12
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