Digi m10 Satellite Modem Hardware Reference Date: 24 November 2009 90033937_B
Copyright Notice Digi International has prepared this manual for the use of its employees, agents, and its customers. This manual contains proprietary information, which is protected by copyright. Preparing derivative works or providing instruction based on this manual is prohibited without written permission from Digi International. All information in this manual is accurate and reliable to the best of Digi International's knowledge.
Document Revision History Version Description Date A Initial release of the new hardware reference manual 21 Sep 2009 B Extended packet information removed. Images updated.
Digi m10 Hardware Reference v 1.20 Table of Contents About This Manual......................................................................................................................... 7 Target Audience .......................................................................................................................... 7 Symbols Used in This Manual ..................................................................................................... 7 Reference Documents ........................
Digi m10 Hardware Reference v 1.20 Appendix B: Digi m10 Development Board Schematic ........................................................... 32 Digi International, Inc.
Digi m10 Hardware Reference v 1.20 List of Tables Table 1: Connector Pins on the Digi m10 ...................................................................................... 11 Table 2: Transmit and Receive Pins.............................................................................................. 12 Table 3: Power Pins ...................................................................................................................... 12 Table 4: Power Enable Pin ...............................
Digi m10 Hardware Reference v 1.20 About This Manual This manual defines and specifies the functions of the Digi m10 and its usage. It also contains guidelines for using the development board which comes with the Digi m10 JumpStart Kit. Target Audience The target audience for this user manual comprises engineers and business managers who want to augment their company's existing asset-tracking systems with satellite networks.
Digi m10 Hardware Reference v 1.20 ORBCOMM Subscriber Communicator Type Approval Plan, A25TP0017. ORBCOMM System Overview, A80TD0008. RoHS FAQ -- http://www.rohs.gov.uk/FAQs.aspx#10 Society of Automotive Engineers, SAE J1455, Joint SAE / TMC Recommended Environmental Practices for Electronic Equipment Design (Heavy-Duty Trucks).
Digi m10 Hardware Reference v 1.20 1. Overview of the Digi m10 The Digi m10 is an ORBCOMM Subscriber Communicator, which enables modem-like access to the ORBCOMM satellite network. It is ideal for machine-to-machine (M2M) applications (e.g. asset tracking, utility meters, pipeline monitoring, etc.) that monitor or control remote assets. It can be added to an existing tracking system or run as a stand-alone modem. Figure 1: Block Diagram 2.
Digi m10 Hardware Reference v 1.20 Figure 2: Digi m10 Pin Numbering The connector provides the necessary interface signals to communicate over a 3.3V TTL level serial link and to power Digi m10. Basic communication can be established using the Tx & Rx lines and the remaining signals provide additional handshaking (RTS/CTS), status (SA/DA) and debug information (Dbg_Tx/Dbg_Rx) as described in the following sections. Refer to Table 1 for details.
Digi m10 Hardware Reference v 1.20 Figure 3: Pin Assignment Table 1: Connector Pins on the Digi m10 Pin Name Description 1 VCC Supply 2 GND Ground 3 VCC Supply 4 GND Ground 5 PWR_EN Digi m10 Power Enable Digital I/O Comments Direction Input 6 GND 7 RX 3.3 V RS232 Interface. Host controller to the Digi m10 Input 8 TX 3.3V RS232 Interface. Digi m10 to host controller. Output 9 SA Satellite Available Output 10 DA Data Available Output 11 Dbg_Tx 3.
Digi m10 Hardware Reference v 1.20 2.2 Serial Interface The main serial interface provides device management and monitoring using 3.3 V levels. The serial data is carried on the Transmit (TX) and Receive (RX) lines. The details of the Transmit and Receive pins are shown in Table 2. An RS232 level shifter is required to connect the Digi m10 to a PC. This is already available on the development board, which comes with the Digi m10 JumpStart Kit. Table 2: Transmit and Receive Pins 2.
Digi m10 Hardware Reference v 1.20 2.4.1 Powering Up To power on the Digi m10, the host controller must provide an input voltage between 9 V and 18 V DC and then set the PWR_EN pin to active high. Typically, the Digi m10 will take two seconds to be in a ready state. After powering on, the Digi m10 will toggle the DA pin once to let the host controller know that it is ready to receive serial commands.
Digi m10 Hardware Reference v 1.20 Figure 5: Timing Diagram for Powering Down It is the responsibility of the host controller to back up all messages, reports, GlobalGrams, etc. before powering down the Digi m10. 2.5 DA (Data Available) The Data Available signal is an active high signal. It is normally low and is driven high when the Digi m10 receives messages, user commands, or Global Grams from the satellite. The signal goes low only after the host controller has cleared the outbound (OB) queue.
Digi m10 Hardware Reference v 1.20 Table 6: SA Pin Pin 9 Name Description SA Satellite Available Figure 7: Timing Diagram for Satellite Available 2.7 RF Interface The RF connector for the Digi m10 (see Figure 8) is an MMCX plug, with an impedance of 50 Ω nominal. Refer to Table 7 for details. Figure 8: RF Connector on the Digi m10 Table 7: RF Interface Details Parameter Value Transmit Power 5 W (37 + / -1 dBm) TX Frequency 148 MHz to 150.
Digi m10 Hardware Reference v 1.20 Parameter Value Sensitivity ≥ -119 dBm Dynamic Range 40 dB Antenna Gain ≥ 0 dBi, in at least one direction Antenna Impedance 50 Ω nominal The Digi m10 is protected from VSWR failure. However, for best performance, Digi International recommends using an antenna with good VSWR readings (see Table 7) at both the RX and TX frequencies. Digi International, Inc.
Digi m10 Hardware Reference v 1.20 3. Technical Specifications This chapter describes the environmental, electrical, and mechanical specifications of the Digi m10. 3.1 Environmental The Digi m10 conforms to the relevant sections of the following documents: 1. ORBCOMM Subscriber Communicator (SC) Standards and Specifications 2. SAE J1455 Joint SAE / TMC Recommended Environmental Practices for Electronic Equipment Design (Heavy-Duty Trucks) 3. FCC Part 2 and Part 25 4.
Digi m10 Hardware Reference v 1.20 3.1.1.4 Conducted Immunity The RF connector on the Digi m10 complies with the test methodology and test levels for conducted immunity defined in EN 300 832. (Refer to Section 4.4 Conducted Immunity of the ORBCOMM Subscriber Communicator (SC) Standards and Specifications document. 3.1.1.
Digi m10 Hardware Reference v 1.20 The Digi m10 has been designed and tested to operate under the conditions shown in Table 8. Table 8: Operating Conditions Operating Temperature Humidity Cycle Comments -40 °F to +185 °F (-40 °C to +85 °C) 70% relative humidity (RH) – 40% moisture by volume For 24 hours with a 12 V supply 3.1.4 Storage Temperature The Digi m10 can be stored for extended periods from -40 °F to +185 °F (-40 °C to +85 °C).
Digi m10 Hardware Reference v 1.20 3.2.1 Power Design 3.2.1.1 Power Supply The Digi m10 operates on a single unregulated power source of 9 V to 18 V DC (nominal 12 V) supplied through the pins of the host connector. The Power ON / OFF control circuit is outside the Digi m10 and is controlled by host controller. Low: OFF state High: ON state The Digi m10 does not have reverse polarity protection. Therefore, ensure that only positive voltage is supplied to avoid damaging it. 3.2.1.
Digi m10 Hardware Reference v 1.20 3.2.2 Digital Input / Output Specifications The output pins can source / sink up to 10mA. For higher currents, the outputs must be buffered. Table 9: Digital I/O Electrical Specifications Parameter Min (V) Max (V) VInput Low 0 0.8 Not applicable (NA) VInput High 2.0 3.3 NA VOutput Low 0 0.4 2 mA VOutput High 2.4 3.3 2 mA 3.2.3 Maximum Recommended Load Lifespan 3.2.3.
Digi m10 Hardware Reference v 1.20 Figure 9: Digi m10 Dimensions 3.3.2 Mounting The Digi m10 can be mounted directly to the host PCB using a board-to-board connector. The Digi m10 has five solder legs, which must be soldered to the host controller’s common ground reference plane. The host controller’s PCB needs to have five mounting holes to accommodate the Digi m10.
Digi m10 Hardware Reference v 1.20 4. Approvals and Certifications The Digi m10 satellite modem carries the following certifications and regulatory approvals and certifications: FCC CE Mark C-Tick (Australia/New Zealand) ORBCOMM Type Approval SAE Digi International, Inc.
Digi m10 Hardware Reference v 1.20 5. Using the Digi m10 This chapter describes the details regarding the functioning of the Digi m10. 5.1 Interfacing with the Digi m10 Figure 10 illustrates how the host controller can be interfaced with the Digi m10. Figure 10: Interface Between the Host Controller and the Digi m10 If Digi m10 is being used, then the UART signals are at TTL levels. 5.
Digi m10 Hardware Reference v 1.20: Figure 11: Layout of the Development Board The different components of the development board are as follows: SW1: This switch is used to power ON the JumpStart kit, which is indicated by the glowing of red LEDs (Digi m10 POWER ENABLE). Power Jack: A 9 - 18 V supply can be fed through this jack. Digi International, Inc.
Digi m10 Hardware Reference v 1.20 Diagnostic Port: The Digi m10’s diagnostics can be accessed through this port using a terminal emulation program. the interface is at RS-232 levels. Amber LEDs next to this port indicate that it is active. Host Port (RS232): Users can send ORBCOMM serial commands to the Digi m10 at RS-232 levels using this port. Amber LEDs next to this port indicate that it is active.
Digi m10 Hardware Reference v 1.20: 6. Antenna Information 1. Which antenna should be used with the Digi m10? Please refer to ORBCOMM Application Note #12, which can be downloaded from http://www.orbcomm.com/equipment/pdf/App_Note_12__ORBCOMM_Antennas.pdf. It provides details and comparisons of antennas from different vendors. 2.
Digi m10 Hardware Reference v 1.20 Appendix A: Digi m10 Mechanical Drawings Figure 12: Digi m10 Mechanical Drawing Figure 13: Digi m10 Mechanical Drawing: Part A Digi International, Inc.
Digi m10 Hardware Reference v 1.20: Figure 14: Digi m10 Mechanical Drawing: Part B Digi International, Inc.
Digi m10 Hardware Reference v 1.20 Figure 15: Digi m10 Mechanical Drawing: Part C Digi International, Inc.
Digi m10 Hardware Reference v 1.20: Figure 16: Digi m10 Mechanical Drawing: Part D Digi International, Inc.
Digi m10 Hardware Reference v 1.20 Appendix B: Development Board Mechanical Drawings Digi International, Inc.
Digi m10 Hardware Reference v 1.20: Appendix C: : Digi m10 Development Board Schematic Figure 17: Development Board Schematic Digi International, Inc.
Digi m10 Hardware Reference v 1.20 Figure 18: Development Board Schematic (Part A) Figure 19: Development Board Schematic (Part B) Figure 20: Development Board Schematic (Part C) Digi International, Inc.
Digi m10 Hardware Reference v 1.20: Figure 21: Development Board Schematic (Part D) Digi International, Inc.
Digi m10 Hardware Reference v 1.20 Digi International, Inc.
