Microhard Systems P900 User manual

Pico Series - P900
900MHz Spread Spectrum Modem
Document: Pico Series P900 Operating Manual.v1.8.7
Date: June 2016
Firmware: v1.19
Operating Manual
150 Country Hills Landing NW
Calgary, Alberta
Canada T3K 5P3
Phone: [phone]
Fax: [phone]
www.microhardcorp.com

© Microhard Systems Inc. Confidential 2
Important User Information
Warranty
Microhard Systems Inc. warrants that each product will be free of defects in material and workmanship for a period of one (1) year for its
products. The warranty commences on the date the product is shipped by Microhard Systems Inc. Microhard Systems Inc.’s sole liability and
responsibility under this warranty is to repair or replace any product which is returned to it by the Buyer and which Microhard Systems Inc.
determines does not conform to the warranty. Product returned to Microhard Systems Inc. for warranty service will be shipped to Microhard
Systems Inc. at Buyer’s expense and will be returned to Buyer at Microhard Systems Inc.’s expense. In no event shall Microhard Systems
Inc. be responsible under this warranty for any defect which is caused by negligence, misuse or mistreatment of a product or for any unit
which has been altered or modified in any way. The warranty of replacement shall terminate with the warranty of the product.
Warranty Disclaims
Microhard Systems Inc. makes no warranties of any nature of kind, expressed or implied, with respect to the hardware, software, and/or
products and hereby disclaims any and all such warranties, including but not limited to warranty of non-infringement, implied warranties of
merchantability for a particular purpose, any interruption or loss of the hardware, software, and/or product, any delay in providing the hard-
ware, software, and/or product or correcting any defect in the hardware, software, and/or product, or any other warranty. The Purchaser
represents and warrants that Microhard Systems Inc. has not made any such warranties to the Purchaser or its agents MICROHARD SYS-
TEMS INC. EXPRESS WARRANTY TO BUYER CONSTITUTES MICROHARD SYSTEMS INC. SOLE LIABILITY AND THE
BUYER’S SOLE REMEDIES. EXCEPT AS THUS PROVIDED, MICROHARD SYSTEMS INC. DISCLAIMS ALL WARRANTIES,
EXPRESS OR IMPLIED, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PROMISE.
MICROHARD SYSTEMS INC. PRODUCTS ARE NOT DESIGNED OR INTENDED TO BE USED IN ANY LIFE SUPPORT
RELATED DEVICE OR SYSTEM RELATED FUNCTIONS NOR AS PART OF ANY OTHER CRITICAL SYSTEM AND ARE
GRANTED NO FUNCTIONAL WARRANTY.
Indemnification
The Purchaser shall indemnify Microhard Systems Inc. and its respective directors, officers, employees, successors and assign s including any
subsidiaries, related corporations, or affiliates, shall be released and discharged from any and all manner of action, causes of action, liability,
losses, damages, suits, dues, sums of money, expenses (including legal fees), general damages, special damages, including without limita-
tion, claims for personal injuries, death or property damage related to the products sold hereunder, costs and demands of every and any kind
and nature whatsoever at law.
IN NO EVENT WILL MICROHARD SYSTEMS INC. BE LIABLE FOR ANY INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDEN-
TAL, BUSINESS INTERRUPTION, CATASTROPHIC, PUNITIVE OR OTHER DAMAGES WHICH MAY BE CLAIMED TO ARISE
IN CONNECTION WITH THE HARDWARE, REGARDLESS OF THE LEGAL THEORY BEHIND SUCH CLAIMS, WHETHER IN
TORT, CONTRACT OR UNDER ANY APPLICABLE STATUTORY OR REGULATORY LAWS, RULES, REGULATIONS, EXECU-
TIVE OR ADMINISTRATIVE ORDERS OR DECLARATIONS OR OTHERWISE, EVEN IF MICROHARD SYSTEMS INC. HAS
BEEN ADVISED OR OTHERWISE HAS KNOWLEDGE OF THE POSSIBILITY OF SUCH DAMAGES AND TAKES NO ACTION TO
PREVENT OR MINIMIZE SUCH DAMAGES. IN THE EVENT THAT REGARDLESS OF THE WARRANTY DISCLAIMERS AND
HOLD HARMLESS PROVISIONS INCLUDED ABOVE MICROHARD SYSTEMS INC. IS SOMEHOW HELD LIABLE OR RESPON-
SIBLE FOR ANY DAMAGE OR INJURY, MICROHARD SYSTEMS INC.'S LIABILITY FOR ANYDAMAGES SHALL NOT EXCEED
THE PROFIT REALIZED BY MICROHARD SYSTEMS INC. ON THE SALE OR PROVISION OF THE HARDWARE TO THE CUS-
TOMER.
Proprietary Rights
The Buyer hereby acknowledges that Microhard Systems Inc. has a proprietary interest and intellectual property rights in the Hardware,
Software and/or Products. The Purchaser shall not (i) remove any copyright, trade secret, trademark or other evidence of Microhard Systems
Inc.’s ownership or proprietary interest or confidentiality other proprietary notices contained on, or in, the Hardware, Software or Products,
(ii) reproduce or modify any Hardware, Software or Products or make any copies thereof, (iii) reverse assemble, reverse engin eer or decom-
pile any Software or copy thereof in whole or in part, (iv) sell, transfer or otherwise make available to others the Hardware, Software, or
Products or documentation thereof or any copy thereof, except in accordance with this Agreement.

© Microhard Systems Inc. Confidential 3
Important User Information (continued)
About This Manual
It is assumed that users of the products described herein have either system integration or design ex-
perience, as well as an understanding of the fundamentals of radio communications.
Throughout this manual you will encounter not only illustrations (that further elaborate on the accom-
panying text), but also several symbols which you should be attentive to:
Caution or Warning
Usually advises against some action which could result in undesired or
detrimental consequences.
Point to Remember
Highlights a key feature, point, or step which is noteworthy. Keeping
these in mind will simplify or enhance device usage.
Tip
An idea or suggestion to improve efficiency or enhance usefulness.

© Microhard Systems Inc. Confidential 4
Important User Information (continued)
Regulatory Requirements
To satisfy FCC RF exposure requirements for mobile transmitting devices, a separation distance
of 23cm or more should be maintained between the antenna of this device and persons during
device operation. To ensure compliance, operation at closer than this distance is not
recommended. The antenna being used for this transmitter must not be co-located in conjunction
with any other antenna or transmitter.
This device can only be used with antennas designed for use with 900 MHz products. Please
contact Microhard Systems Inc. if you need more information or would like to order an antenna.
WARNING
MAXIMUM EIRP
FCC Regulations allow up to 36dBm Effective Isotropic Radiated Power (EIRP). Therefore, the
sum of the transmitted power (in dBm), the cabling loss and the antenna gain cannot exceed
36dBm.
WARNING
EQUIPMENT LABELING
This device has been modularly approved. The manufacturer, product name, and FCC and
Industry Canada identifiers of this product must appear on the outside label of the end-user
equipment.
WARNING
FCCID: NS913P900
IC: 3143A-13P900
This device complies with Part 15 of the FCC Rules.
Operation is subject to the following two conditions:
(1) this device may not cause harmful interference,
and (2) this device must accept any interference
received including interference that may cause
undesired operation.
Please Note: These are only sample labels; different products contain different identifiers. The
actual identifiers should be seen on your devices if applicable.
SAMPLE LABEL REQUIREMENT:
For P900

© Microhard Systems Inc. Confidential 5
Revision History
Revision Description Initials Date
1.0 Draft PEH Mar 2013
1.1 Firmware v1.0 PEH Sept 2013
1.2 Official Release. Firmware v1.0. Added PTP, PMP Modes PEH Sept 2013
1.21 Added Pad Landing and Solder Mask/Paste diagrams, expanded Mesh
description, modified pins descriptions, added AT command firmware
upgrade, misc formatting corrections.
PEH Sept 2013
1.22 Misc Corrections PEH Feb 2014
1.3 Added RS485 Support (S142). Firmware required v1.06. PEH July 2014
1.4 Update for firmware v1.09 SG/PEH Dec 2014
1.5 Update for firmware v1.10—Added link rate 57.6 kbps, minor bugs
fixed. Added register S225 - Compression (must be set to zero for com-
patibility with older versions).
SG/PEH Jan 2015
1.6 Update for firmware v1.11 - Added link rate 115.2 kbps. Added AT&S3
to enable RS485 driver.
PEH Jan 2015
1.7 Update for firmware v1.14 - Removed AT&S3, Added AT&K1 to use
CTS to control the Transmitter of RS485 driver chip.
PEH Aug 2015
1.8 Added P900-ENC drawings, connectors and LED descriptions PEH Sept 2015
1.81 Added P900-ENC Optional mounting Bracket. Misc updates. PEH Oct 2015
1.8.2 Modified description of S232. PEH Jan 2016
1.8.3 Updated Enclosed DB9 RS232/485 Pins. PEH Feb 2016
1.8.4 Added S159, S177 for AES Encryption PEH Feb 2016
1.8.5 Pin corrections PEH Feb 2016
1.8.6 Added MST reflow and baking instructions, misc corrections. PEH June 2016
1.8.7 Added Pico-MHX Adapter Board PEH June 2016

© Microhard Systems Inc. Confidential 6
Table of Contents
1.0 Overview 10
1.1 Performance Features ........................................................................................................ 10
1.2 Specifications ..................................................................................................................... 11
2.0 Hardware Description 12
2.1 OEM Mechanical Drawing .................................................................................................. 13
2.1.1 Recommended Solder Mask (Pad Landing).............................................................................14
2.1.2 Recommended Solder Paste Pattern.......................................................................................15
2.1.3 OEM Connectors ....................................................................................................................15
2.1.4 SMT Temperature Profile ........................................................................................................16
2.1.5 Baking Instructions (MSL) .......................................................................................................16
2.2 OEM Pin Descriptions ........................................................................................................ 17
2.3 OEM Minimum Connection Requirements ........................................................................ 20
2.4 Electrical Characteristics ................................................................................................... 21
2.4.1 Test Conditions.....................................................................................................................21
2.4.1.1 Minimum and Maximum Values ...............................................................................21
2.4.1.2 Typical Values.........................................................................................................21
2.4.1.3 Loading Capacitor ...................................................................................................21
2.4.1.4 Pin Input Voltage.....................................................................................................21
2.4.2 Absolute Maximum Ratings..................................................................................................22
2.4.3 Operating Conditions ...........................................................................................................22
2.4.3.1 Operating Conditions at Power-up / Power-down......................................................22
2.4.3.2 Voltage Characteristics............................................................................................22
2.4.3.3 Current Characteristics ............................................................................................23
2.4.3.4 IO Port Characteristics.............................................................................................24
2.4.3.5 12-bit ADC Characteristics.......................................................................................25
2.5 P900 to n920 Pin-outs......................................................................................................... 27
2.6 P900 Enclosed ..................................................................................................................................28
2.6.1 P900 Enclosed Mechanical Drawings......................................................................................29
2.6.2 P900 Enclosed Mounting Bracket (Optional) ............................................................................30
2.6.3 P900 Enclosed Connectors & Indicators..................................................................................31
3.0 Mesh Configuration 33
3.1 Configuration/Unit Modes .................................................................................................. 33
3.1.1 Command Mode .....................................................................................................................33
3.1.2 Data mode..............................................................................................................................34
3.2 Mesh Network ..................................................................................................................... 35
3.2.1 Operating Modes / Unit Types .................................................................................................35
3.2.2 Configuration Using Factory Defaults.......................................................................................39
AT&F1 - Primary Coordinator ..................................................................................................40
AT&F2 - Mesh Remote ...........................................................................................................41
AT&F3 - Secondary Coordinator..............................................................................................42
Standby Coordinator ...............................................................................................................43
3.2.3 Unit Addressing ......................................................................................................................44
3.2.4 Collision Mitigation..................................................................................................................45
3.2.4.1 Channel Access Mode.............................................................................................45
3.2.4.2 Carrier Sense ..........................................................................................................46
3.2.4.3 TX Profile & Ranking ...............................................................................................48
3.2.5 Retransmissions .....................................................................................................................49
3.2.6 Network Synchronization.........................................................................................................49
3.2.7 Routing...................................................................................................................................50
3.2.8 Hop Pattern ............................................................................................................................55

© Microhard Systems Inc. Confidential 7
Table of Contents (continued)
4.0 Point to Point Configuration 57
4.1 Configuration/Unit Modes .................................................................................................. 57
4.1.1 Command Mode .....................................................................................................................57
4.1.2 Data mode..............................................................................................................................58
4.2 Point to Point Network ....................................................................................................... 59
4.2.1 Operating Modes / Unit Types .................................................................................................59
4.2.2 Configuration Using Factory Defaults.......................................................................................61
AT&F10 - PP Master...............................................................................................................62
AT&F11 - PP Slave/Remote....................................................................................................63
AT&F12 - PP Repeater ...........................................................................................................64
4.2.5 Retransmissions .....................................................................................................................65
4.2.6 Network Synchronization.........................................................................................................65
4.2.7 Hop Pattern ............................................................................................................................66
5.0 Point to Multipoint Configuration 68
5.1 Configuration/Unit Modes .................................................................................................. 68
5.1.1 Command Mode .....................................................................................................................68
5.1.2 Data mode..............................................................................................................................69
5.2 Point to Multipoint Network ............................................................................................... 70
5.2.1 Operating Modes / Unit Types .................................................................................................70
5.2.2 Configuration Using Factory Defaults.......................................................................................73
AT&F7 - PMP Master..............................................................................................................74
AT&F8 - PMP Slave/Remote...................................................................................................75
AT&F9 - PMP Repeater ..........................................................................................................76
5.2.3 Unit Addressing ......................................................................................................................77
5.2.4 Retransmissions .....................................................................................................................77
5.2.5 Network Synchronization.........................................................................................................77
5.2.6 Hop Pattern ............................................................................................................................78
6.0 Register/Command Reference 80
6.1 AT Commands................................................................................................................... 80
A Answer .................................................................................................................................80
g, G Spectrum Analyzer ................................................................................................................80
In Identification .........................................................................................................................80
login Enable login password ..........................................................................................................81
M Mesh Diagnostics Menu ........................................................................................................81
N Advanced Spectrum Analyzer................................................................................................82
&FnLoad Factory Default Configuration........................................................................................82
&V View Configuration................................................................................................................82
&W Write Configuration to Memory ..............................................................................................82
6.2 Settings (S) Registers ....................................................................................................... 83
S0 Power-up Mode.....................................................................................................................83
S2 Escape Character .................................................................................................................83
S80 Transmit Profiles ...................................................................................................................83
S81 CS Threshold........................................................................................................................83
S83 Records TTL.........................................................................................................................84
S85 Distance to Master (PP/PMP) ................................................................................................84
S86 Distance from Master (PP/PMP) ............................................................................................84
S87 Enable S105 as MAC (Mesh) ................................................................................................84
S101 Operating Mode (Mesh).........................................................................................................85
S101 Operating Mode (PP/PMP) ....................................................................................................85
S102 Serial Baud Rate...................................................................................................................85
S103 Wireless Link Rate ................................................................................................................85
S104 Network ID/Address ..............................................................................................................86

© Microhard Systems Inc. Confidential 8
Table of Contents (continued)
6.2 Settings (S) Registers (continued)
S105 Unit Address .........................................................................................................................86
S106 Hop Pattern ..........................................................................................................................86
S108 Output Power........................................................................................................................86
S109 Hop Interval ..........................................................................................................................87
S110 Data Format..........................................................................................................................87
S111 Packet Min Size ....................................................................................................................88
S112 Packet Max Size ...................................................................................................................88
S113 Packet Retransmissions ........................................................................................................88
S115 Repeat Interval......................................................................................................................88
S116 Character Timeout ................................................................................................................88
S118 Roaming (PP/PMP)...............................................................................................................89
S123 Average RSSI (Mesh) ...........................................................................................................89
S123 RSSI from Master (dBm) (PP/PMP) .......................................................................................89
S124 RSSI from Slave (dBm) (PP/PMP) .........................................................................................89
S126 Attempt Before Re-Route (Mesh)...........................................................................................89
S130 No Sync Data Intake .............................................................................................................89
S133 Network Type........................................................................................................................90
S140 Destination Address ..............................................................................................................90
S141 Repeaters Y/N (PP/PMP) ......................................................................................................90
S142 Serial Channel Mode (RS232/485).........................................................................................90
S143 Sleep Mode ..........................................................................................................................90
S144 Sleep Time ...........................................................................................................................91
S145 Wake Time ...........................................................................................................................91
S146 Tx Done Timeout, 1/4............................................................................................................91
S151 Quick Sync Packets (Mesh)...................................................................................................91
S153 Address Tag .........................................................................................................................91
S158 Forward Error Correction (FEC) Mode ...................................................................................92
S159 Encryption Mode (AES) .........................................................................................................92
S163 CRC Check on Diag Port.......................................................................................................93
S177 Binary Encryption Key ...........................................................................................................93
S180 Hop Zone..............................................................................................................................93
S181 Secondary Hop Zone ............................................................................................................93
S183 DCD Pulse Period (PP/PMP).................................................................................................93
S184 Data Time to Live (Mesh) ......................................................................................................94
S206 Secondary Hop Pattern .........................................................................................................94
S214 Number of Aloha Slots (Mesh) ...............................................................................................94
S215 Number of Mesh Slots (Mesh) ...............................................................................................94
S216 Mesh Duty Cycle (Mesh) .......................................................................................................94
S217 Protocol Type........................................................................................................................95
S218 Input Framing........................................................................................................................95
S219 Routing Request TTL (Mesh).................................................................................................95
S220 Mesh Coordinator Rank (Mesh) .............................................................................................95
S221 Mesh TDMA Slot to Tx (Mesh)...............................................................................................95
S222 Roaming Mode (Mesh) ..........................................................................................................95
S223 Routing (Mesh) .....................................................................................................................96
S224 Standby Trip Level (Mesh).....................................................................................................96
S225 Compression Mode ...............................................................................................................96
S232 Max Buffer in Storage............................................................................................................96
S234 Master Ch. Request Timeout (PMP) ......................................................................................97
S235 PP Routing TTL (PP).............................................................................................................97
S236 Max Buffer Out Storage.........................................................................................................97
S244 Channel Access Mode...........................................................................................................97
S245 Cost of Hop in Mesh..............................................................................................................97
S247 Country Code (Read Only) ....................................................................................................97
S248 Sync Timeout........................................................................................................................98

© Microhard Systems Inc. Confidential 9
Table of Contents (continued)
S249 Packets per Hop Tx Limit (PP/PMP) ......................................................................................98
S250 Master Bandwidth % (PMP)...................................................................................................98
S251 Master Hop Allocation Timeout (PMP) ...................................................................................98
S252 Slave Ch. Allocation Timeout (PMP) ......................................................................................98
6.3 Serial Interface Commands .............................................................................................. 99
&Cn Data Carrier Detect (DCD).....................................................................................................99
&Dn Data Terminal Ready (DTR) ..................................................................................................99
&K Handshaking.........................................................................................................................99
&Sn Data Set Ready (DSR) ..........................................................................................................99
7.0 Installation 100
7.1 Path Calculation.............................................................................................................. 102
7.2 Installation of Antenna System Components ................................................................ 103
7.2.1 Antennas ............................................................................................................................103
7.2.2 Coaxial Cable .....................................................................................................................104
7.2.3 Surge Arrestors...................................................................................................................104
7.2.4 External Filter......................................................................................................................104
Appendices
Appendix A: AT Command Quick Reference .....................................................................................105
Appendix B: Settings (S) Register Quick Reference..........................................................................106
Appendix C: AT Utility Firmware Upgrade Procedure........................................................................107
Appendix D: AT Command Firmware Upgrade ..................................................................................108
Appendix E: Development Board Serial Interface..............................................................................109
Appendix F: Pico Reference Schematic.............................................................................................110
Appendix G: Pico-MHX Adapter Board...............................................................................................111
Appendix H: Approved Antennas.......................................................................................................113

© Microhard Systems Inc. Confidential 10
1.0 Overview
The Pico Series P900 is capable of delivering high-performance wireless serial communica-
tions in robust and secure Mesh, Point to Point or Point to Multipoint topologies.
The Pico Series is available as a low cost OEM module, for the ultimate in design integration.
When properly configured and installed, long range communications at very high speeds can
be achieved.
Pico Series modules operate within the 902-928 MHz ISM frequency band, using frequency
hopping spread spectrum (FHSS) technology, providing reliable wireless asynchronous data
transfer between most equipment types which employ a serial interface.
The small size and superior performance of the Pico Series makes it ideal for many applica-
tions. Some typical uses for this modem:
1.1 Performance Features
Key performance features of the Pico Series include:
 transmission within a public, license-exempt band of the radio spectrum1- this
means that the modems may be used without access fees or recurring charges
(such as those incurred by cellular airtime)
 transparent, low latency link rates up to 276 kbps
 communicates with virtually all serial based devices
 supports a robust true Mesh operation with auto-routing
 wide temperature specification
 maximum allowable transmit power (1 Watt)
 32 bits of CRC, selectable retransmission and forward error correction
 separate diagnostics port - transparent remote diagnostics and online network
control
 ease of installation and configuration - the P900 utilizes a subset of standard AT-
style commands, similar to those used by traditional telephone line modems
 3.3V logic level compatibility
1902-928 MHz, which is license-free within North America; may need to be factory-configured dif-
ferently for some countries, contact Microhard Systems Inc. for details.
 SCADA
 remote telemetry
 traffic control
 industrial controls
 remote monitoring
 fleet management
 GPS
 metering
 robotics
 display signs
 railway signaling

© Microhard Systems Inc. Confidential 11
1.0 Overview
1.2 Pico Series P900 Specifications
Electrical/General
Frequency: 902 - 928 MHz
Spreading Method: Frequency Hopping
Band Segments: Selectable via Freq. Zones
Error Detection: 32 bits of CRC, ARQ
Data Encryption: 128, 196 or 256-bit AES Encryption (Requires export
(Optional) permit outside US and Canada.)
Range: 40 miles (60km)
Output Power: 100mW to 1W (20-30dBm)
Sensitivity:
Serial Baud Rate: Up to 230.4 kbps asynchronous
Link Rate: Up to 276 kbps
Environmental
Operation Temperature: -40oF(-40oC) to 185oF(85oC)
Humidity: 5% to 95% non-condensing
Mechanical
Dimensions: Approx: 1.05” (26.5mm) X 1.3” (33mm) X 0.13”(3.5mm)
Weight: Approx: 5 grams
Connectors: Antenna: UFL
Data: 80 Pin/Pad SMT
Caution: Using a power
supply that does not
provide proper voltage or
current may damage the
modem.
Link Rate 10-6BER 10-3BER
57.6 kbps -111 dBm -114 dBm
115.2 kbps -110 dBm -113 dBm
172 kbps -108 dBm -111 dBm
230 kbps -107 dBm -110 dBm
276 kbps -106 dBm -109 dBm

© Microhard Systems Inc. Confidential 12
2.0 Hardware Description
The Pico Series P900 Modem modules are available as a low cost OEM module. This OEM
version supplies all the required raw signals to allow the unit to be tightly integrated into
applications to efficiently maximize space and power requirements. The Microhard
development board can provide a convenient evaluation platform to test and design with the
module. (Contact Microhard Systems for details)
Any P900 Series module may be configured as a Primary Coordinator, Secondary
Coordinator, Standby Coordinator or Remote in a Mesh Topology, or a Master, Repeater or
Remote in a PP or PMP Topology. This versatility is very convenient from a ’sparing’
perspective, as well for convenience in becoming familiar and proficient with using the
module: if you are familiar with one unit, you will be familiar with all units.
Image 2-1: Pico P900 Top View
Image 2-2: Pico P900 Bottom View

© Microhard Systems Inc. Confidential 13
2.0 Hardware Description
2.1 Mechanical Drawings
The P900 OEM Modules have an extremely small form factor as seen in Drawing 3-3 below.
Drawing 2-1: P900 OEM Mechanical
Units: millimeters
33
26.5
3.68
2.31
33
3.5
1. Ground plane must be connected to GND for required heat dissi-
pation.
2. Due to manufacturing methods additional PCB material may be
present on the corners that cannot be removed. Designs should
allow for a small tolerance of this additional material, ± 0.25mm
Detail(A)
(2)
(2)
(2)
0.80
1.27 1.18
Bottom View
Ground Plane(1)
Detail(A)
22.35
28.70
30.01
2.16
19.85
1.50
3.41
See Notes(2)

© Microhard Systems Inc. Confidential 14
1.27
0.81
1.83
2.0 Hardware Description
2.1.1 Recommended Solder Mask (Pad Landing)
Drawing 2-2: P900 Recommended Solder Mask
Units: millimeters
Detail(B)
22.35
30.02
0.99
19.86
28.70
27.99
34.34
Detail(B)

© Microhard Systems Inc. Confidential 15
19.91
30.0734.39
28.04
2.18
2.0 Hardware Description
2.1.2 Recommended Solder Paste Pattern
Drawing 2-3: P900 Recommended Solder Paste
Units: millimeters
Detail(C)
Detail(C)
2.1.3 OEM Connectors
Antenna
All P900 OEM Modules use an UFL connector for the antenna connection.
Data
The interface to the P900 OEM module is a tight integration using 80 pad SMT connections.
Detail(D)
Detail(D)
1.88
2.55
1.27
1.03
0.86
3.50
3.38
4.12
1.00

© Microhard Systems Inc. Confidential 16
2.0 Hardware Description
2.1.4 SMT Temperature Profile
Drawing 2-4: Reflow Profile
2.1.5 SMT Baking Instructions (MSL)
The P900 OEM modules must be baked before mounting, the following baking instruction should be fol-
lowed for the best results:
a) Minimum of 8 to 12 hours at 125°C +/- 5°C for high-temperature device containers.
b) Unused modules should be stored at ≤ 10% RH
0.0
60.0
120.0
180.0
240
300
165
217
60~100s 120s
TMAX=255oC
2.42(oC/s)
Temperature Zone Time Parameter
Preheat zone:
(40oC - 165oC)
- Heating rate:
0.5oC/s-2oC/s
Soak Zone:
(165oC - 217oC)
60 - 100s -
Reflow zone:
(>217oC)
120s Peak reflow:
255oC
Cooling zone Cooling rate: 2oC/s ≤ Slope ≤ 5oC/s
Table 2-1: Reflow Parameters
Zone Temperature (oC)
1 120
2 140
3 160
4 180
5 215
6 255
7 255
8 255
9 250
10 130
Chain Speed: 60cm/min
Table 2-2: Oven Temperature Profile

© Microhard Systems Inc. Confidential 17
2.0 Hardware Description
Drawing 2-5: Pico P900 80-pin OEM Connection Info
2.2 Pico OEM Pin Descriptions
The above drawing depicts a top view of the P900-OEM Module. The corner pads (1, 25, 41,
and 65) are printed directly on the bottom of the PCB for easy identification.
A full description of the connections and function of each pin is provided on the pages that
follow.
Inputs and outputs are
3.3V nominal (3.0V min
—3.6V max) unless
otherwise specified.
GND
Vcc
Vcc
Vdd
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Pico Series
P900
(Top View) CANRX
CANTX
1
GND
DNC
DNC
DNC
DNC
DNC
USR1 - GPS/1PPS
USR2 - Alarm
USR3
I/O1
I/O2
I/O3
I/O4
USR AO0
USR AN0
USR AN1
GND
USBDP
USBDM
RSSI LED1
RSSI LED2
RSSI LED3
Reserved
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24 40393837363534333231302928272625 41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
80 79 78 77 76 75 74 73 72 71 70 69 68
67 66 65
LED RX
LED TX
GND GND GND GND GND
DNC DNC DNC DNC DNC
Reserved Reserved
GND GND GND
Reserved
Wakeup_usr
!CONFIG
!RESET
RSMode
Reserved
Vbat
GND
GND GND Serial RING Serial RxD Serial TxD Serial DSR Serial CTS Serial DTR Serial DCD Serial RTS USR SCK
Reserved Control RxD
Control TxD GND GND

© Microhard Systems Inc. Confidential 18
2.0 Hardware Description
Pin Name No. Description Dir
GND 1,17,25-26,39-
41,65-67,75-80
Ground reference for logic, radio, and I/O pins.
DNC 2,3,4,5,6 Reserved for factory use only.
USR1 –
GPS/1PPS
7 *Currently Not Supported. For Future Expansion* I
USR2 - Alarm 8 *Reserved for future use.* O
USR3 9 *Reserved for future use.* O
I/O 1,2 10,11 Digital Outputs. 3.3 V Output @ 3mA maximum. O
I/O3,4 12,13 Future Use I/O
USR_ANO0 14 *Currently Not Supported. For Future Expansion* O
USR_AN0
USR_AN1
15
16
Analog Inputs. 0 to 3V input, 12 bit. I
USBDP 18 *Currently Not Supported. For Future Expansion*
USBDM 19 *Currently Not Supported. For Future Expansion*
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 RING 27 Internally connected to GND through a 22kΩresistor. In RS485
modes the RING line is set high and is normally used to enable the
receiver of the RS485 driver.
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 may be used to
enable the transmitter of the RS485 driver chip.
O
Serial CTS 31 Clear To Send. Active low output. The CTS line may be used to
enable the transmitter of the RS485 driver chip.
O
Serial DTR 32 Data Terminal Ready. Active low input. I
Serial DCD 33 Data Carrier Detect. Active low output. O
Serial RTS 34 Request To Send. Active low input. I
USR SCK 35 *Currently Not Supported. For Future Expansion* I
Table 2-3: Pico Series Pin Description
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.

© Microhard Systems Inc. Confidential 19
2.0 Hardware Description
Pin Name No. Description Dir
Reserved 36 *Reserved for future use.*
Control RxD 37 Diagnostics receive data. Logic level input from a PC to the module. I
Control TxD 38 Diagnostics transmit data. Logic level output from module to a PC. O
Vbat 42 Input voltage sensing analog input line, up to 60VDC maximum. Used to
measure the main supply voltage. User design must add a 10kΩ1% 1/16W
resistor in series.
I
Reserved 43 *Reserved for future use.*
RSMode 44 Internally connected to GND through a 10kΩresistor. *Reserved for future
use.*
O
!RESET 45 Active low input will reset the module. I
!CONFIG 46 Active low input signal to put module into default serial interface (RS232) and
default baud rate (9600/8/N/1) during power up. Pull high or leave floating.
I
!Wakeup_usr 47 Active high input used to wake the model from sleep mode. I
Reserved 48 *Reserved for future use.*
Reserved 49 *Reserved for future use.*
CANTX 50 *Currently Not Supported. For Future Expansion*
CANRX 51 *Currently Not Supported. For Future Expansion*
Reserved 52-61 *Reserved for future use.*
Vdd 62 Positive voltage supply voltage for the digital section of the module (3.3V). I
Vcc 63,64 Positive voltage supply voltage for the radio module (3.3V). The Vcc lines are
internally connected together.
I
Reserved 68,69 *Reserved for future use.*
DNC 70-74 Reserved for factory use only.
Table 2-3: Pico Series Pin 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.
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.

© Microhard Systems Inc. Confidential 20
2.0 Hardware Description
2.3 Minimum Connection Requirements
Drawing 2-6: P900 Minimum Connection Block Diagram
P900
Antenna
1 17 25 26 39 40 41 65 66 67 78 79 80
GND Pins
62 63 64
UFL
VCC VDD
29 Serial TxD
28 Serial RxD
3.3V
Optional
Driver
RS-232