© Microhard Systems Inc.
25
3.0 Hardware Description
Table 10: RS-232 Interface
Pin Name
No. Description
In/
Out
Vcc
1, 2 Positive supply voltage.
I
3.3V or 5.5V
Select
3 Output voltage level selector. When connected to 3.3VDC, the module
will output 3.3V on its output pins; when connected to 5VDC, 5VDC will
be presented as TTL high on the module’s output pins.
I
VClock
4 Real time clock to wake-up the module from sleep mode.
I
!Shutdown
5 Input to manually shutdown the module.
I
!Bootpgm_Mode
6 Input to download firmware.
I
USR_AN0
7 Analog input. *Reserved for future use.*
I
!WAKEUP_usr
8 Input to wake-up the module from sleep mode.
I
!CONFIG
9 Input to put the module into default serial interface during power-up.
I
!RESET
10 Active low input will reset module.
I
Vbat
11 Battery voltage sensing analog input line,.
I
RSMode
12 Sleep mode indication output. Active high.
O
GND
13-17 Ground reference for logic, radio, and I/O pins.
USR_1
18 System status indicator.
O
USR_2
19 *Reserved for future use.*
O
USR_3
20 *Reserved for future use.*
O
Serial DCD
21 Data Carrier Detect. Active low output.
O
Serial RxD
22 Receive Data. Logic level output.
O
Serial TxD
23 Transmit Data. Logic level input.
I
Serial DTR
24 Data Terminal Ready. Active low input.
I
Serial RING
25 Ring indicator for RS-232.
O
Serial DSR
26 Data Set Ready.
O
Serial RTS
27 Request To Send. Active low input.
I
Serial CTS
28 Clear To Send. Active low output.
O
RSSI1_LED
29 Receive Signal Strength Indicator 1.
O
RSSI2_LED
30 Receive Signal Strength Indicator 2.
O
RSSI3_LED
31 Receive Signal Strength Indicator 3.
O
LED_TX
32 Output indicates module is transmitting data over the RF channel.
O
LED_RX
33 Output indicates receive and synchronization status.
O
Control TxD
34 Diagnostics Tx data. Logic level Input from a PC or terminal to Nano.
I
Control RxD
35 Diagnostics Rx data. Logic level output from Nano to a PC or terminal.
O
USR_SCK
38 User Synchronization Clock. Required for high speed data transfer in
the Nano Turbo.
I
N/C
36,37,
39,40
Reserved for factory use only.
Table 3-4: Nano Interface Card Pin-Out Description
Caution:
For detailed pin
functions see
Section 3.1.3
Nano
Series
Pin-Out
Description
.
