© Microhard Systems Inc.
17
3.0 Hardware Description
Pin Name
No.
Description
In/
Out
RSSI2_LED
28 Receive Signal Strength Indicator 2.
Active high, can drive LED directly. Refer to Section 3.4.2 for
additional information about LED operation.
O
RSSI1_LED
30 Receive Signal Strength Indicator 1. Active high, can drive LED
directly. Refer to Section 3.4.2 for additional information about LED
operation.
O
Serial CTS
32 Clear To Send. Active low output.
O
Serial RTS
34 Request To Send. Active low input.
I
Serial DSR
36 Data Set Ready. Active low output. Could be used to drive
Transmitter Enable on RS-485 driver.
O
Serial RING
38 Ring indicator for RS-232. Active low output. This signal/pin could be
used to drive Receive Enable on RS-485 driver.
O
Serial DTR
40 Data Terminal Ready. Active low input.
I
Serial TxD
42 Transmit Data. Logic level input into the modem.
I
Serial RxD
44 Receive Data. Logic level output from the modem.
O
Serial DCD
46 Data Carrier Detect. Active low output.
O
USR_1/PPS
35 System status indicator.
O
USR_2
37 *Reserved for future use.*
O
USR_3
39 *Reserved for future use.*
O
Mode Line
41 *Reserved for future use.*
5V/8V
43,45,47,
49
*Reserved for future use.*
Reserved
48 *Reserved for future use.*
USR_SCK
50 User Synchronization Clock. Required for high speed data transfer in
the Nano Turbo.
I
Vcc
51,53,55,
57,59
Positive voltage supply voltage for the module (3.3V).
I
GND
52,54,56,
58,60
Ground reference for logic, radio, and I/O pins.
Table 3-1: Nano Series Pin-Out Description (continued)
All serial communications signals are logic level (0 and 3.3V). DO NOT connect RS-
232 level (+12, -12VDC) signals to these lines without shifting the signals to logic
levels.
Serial RxD is the data received by the radio through the wireless link and output via
the serial port; Serial TxD is the data received into module from the serial port and
transmitted over the wireless link.
