© Microhard Systems Inc. 26
3.0 Hardware Features
Pin Name No. Description Dir
GND 1,17,25-26,39-
40,65-80
Ground reference for logic, radio, and I/O pins.
DNC 2,3,4,5,6 Reserved for factory use only.
NC 7,8,9,10,12,27,
33,35,36,37,38,
45,46,47,48,50,
51,52,53,54,59
*Currently Not Supported. For Future Expansion*
CPU STATUS
LED
11 Active high output indicates CPU/Module status. Active high, cannot
drive LED directly. Requires current limiting resistor. 8mA maximum.
O
ETH_BIAS 13 Bias Voltage to Ethernet PHY transformer
USB_MODE 14 Indicates if the interface is in host/device mode. 0 = Device, 1 = Host. I
Config 15 Active low. In normal mode, pull it low and hold for more than 8 seconds
will reset the system to default settings. Pull it low upon power up will put
the module into recovery mode.
I
RESET 16 Active low input will reset module I
USBDP 18 USB D- signal; carries USB data to and from the USB 2.0 PHY
USBDM 19 USB D+ signal; carries USB data to and from the USB 2.0 PHY
LED_1 (RSSI1) 20 Receive Signal Strength Indicator 1. Active high, cannot drive LED
directly. Requires current limiting resistor. 8mA maximum.
O
LED_2 (RSSI2) 21 Receive Signal Strength Indicator 2. Active high, cannot drive LED
directly. Requires current limiting resistor. 8mA maximum.
O
LED_3 (RSSI3)
22
Receive Signal Strength Indicator 3. Active high, cannot drive LED
directly. Requires current limiting resistor. 8mA maximum.
O
LED_RX 23 Active high output indicates receive and synchronization status. Active
high, cannot drive LED directly. Requires current limiting resistor. 8mA
maximum.
O
LED_TX 24 Active high output indicates module is transmitting data over the RF
channel. Active high, cannot drive LED directly. Requires current
limiting resistor. 8mA maximum.
O
Serial RxD 28 Receive Data. Logic level input into the modem. It is recommended to
wire this pin out through a zero ohm resister to a header and jumper
block for external access to the serial port for modem recovery
procedures.
I
Serial TxD 29 Transmit Data. Logic level Output from the modem. It is recommended
to wire this pin out through a zero ohm resister to a header and jumper
block for external access to the serial port for modem recovery
procedures.
O
Serial DSR 30
Data Set Ready. Active low output. The DSR line set high enables the
transmitter of the RS485 driver.
O
Serial CTS 31 Clear To Send. Active low output. O
Serial DTR 32 Data Terminal Ready. Active Low output. O
Serial RTS 34 Request To Send. Active low input. I
Caution: During power up
or reset, output pins from
the Pico are in an unknown
state. It is advised to use
pull up or pull down
resisters as appropriate.
Table 3-1: pX2 Pin Description
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.
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