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TRM-915-R250RF Transceiver Module Data Guide

– –– –14 15GUID Networking ModeGUID networking mode is the simplest mode and supports point-to-point and broadcast communications. Each module

– –– –16 17User Networking ModeUser Networking Mode is a more complicated scheme than GUID mode. It uses the customer ID bytes (regCUSTID[0-1]

– –– –18 19Extended User Addressing ModeExtended User Networking Mode is the same as User Networking Mode but uses longer addresses. The two c

– –– –20 21Extended PreambleAs the receivers scan the hop sequence channels they look for the preamble from a transmitter. When they detect th

– –– –22 23Voltage Supply Rise TimeThe power supply rise time is extremely important. It must rise from ground to 2.7V in less than 1ms. If th

– –– –24 25250 Series Transceiver Reset Circuit SpecificationsParameter Min. Typ. Max. Units NotesRESET Output Low Voltage 0.6 V VCC = 2.7 – 3.

– –– –26 27Using the Command Response (CMD_RSP) LineThe CMD_RSP line is normally high, but the module lowers this line when responding to a UA

– –– –28 29The UART InterfaceThe module uses a standard UART interface for both data to be sent over the air and for configuring the module. Th

– –– –30 31Module CongurationThe 250 Series module contains several registers that control its configuration and operation. The module’s defau

– –– –32 33Figure 23: 250 Series Non-volatile Read-Only Configuration Registers250 Series Non-Volatile Read-Only RegistersName Address Descript

Table of Contents 1 Description 2 Ordering Information 2 Absolute Maximum Ratings 3 Electrical Specications 4 Pin Assignments 5 Pin Description

– –– –34 35Conguration RegistersThe following sections give details on each configuration register. Green addresses in the tables are volatile

– –– –36 37Power Mode - Address = 0x4D; NV Address = 0x02The value in the regPWRMODE register sets the module’s output power.Figure 30 shows t

– –– –38 39Network Mode - Address = 0x4F; NV Address = 0x04The module supports three networking modes: GUID, User, and Extended User. For each

– –– –40 41Maximum Transmit Retries - Address = 0x52; NV Address = 0x07regMAXTXRETRY sets the number of transmission retries if an acknowledge

– –– –42 43UART Minimum Transmission Unit - Addr = 0x54; NV Addr = 0x09This register determines the UART buffer level that triggers the transm

– –– –44 45CSMA Enable - Address = 0x56; NV Address = 0x0BCarrier-Sense Multiple Access (CSMA) is a transmission protocol that listens to the

– –– –46 47ACK on Wake - Address = 0x59; NV Address = 0x0EWhen the module powers up and is ready for operation, it can output an acknowledge (

– –– –48 49User ID MaskThese registers contain the user ID mask when User Networking mode or Extended User Networking mode are enabled. User N

– –– –50 51CMD Halts Traffic- Address = 0x6E; NV Address = 0x23When configuring the module’s register settings, it is possible that incoming RF

– –– –52 53Compatibility Mode - Address = 0x70; NV Address = 0x25Compatibility mode allows the 250 Series modules to communicate with the 25 S

– –1DescriptionThe 250 Series RF transceiver module is designed for reliable bi-directional transfer of serial data over distances of up to 4 mile

– –– –54 55My GUIDThese registers contain the factory-programmed read-only GUID address. This address is unique for each module and is used by

– –– –56 57Last Good Packet RSSI - Address = 0x7BThis register holds the received signal strength in dBm of the last successful received packe

– –– –58 59Antenna ConsiderationsThe choice of antennas is a critical and often overlooked design consideration. The range, performance and le

– –– –60 61Interference ConsiderationsThe RF spectrum is crowded and the potential for conflict with unwanted sources of RF is very real. While

– –– –62 63Make sure internal wiring is routed away from the module and antenna and is secured to prevent displacement.Do not route PCB traces

– –– –64 65Production GuidelinesThe module is housed in a hybrid SMD package that supports hand and automated assembly techniques. Since the m

– –– –66 67General Antenna RulesThe following general rules should help in maximizing antenna performance.1. Proximity to objects such as a u

– –– –68 69Common Antenna StylesThere are hundreds of antenna styles and variations that can be employed with Linx RF modules. Following is a

– –– –70 71Regulatory ConsiderationsWhen working with RF, a clear distinction must be made between what is technically possible and what is le

DisclaimerLinx Technologies is continually striving to improve the quality and function of its products. For this reason, we reserve the right to mak

– –– –2 3250 Series Transceiver SpecificationsParameter Symbol Min. Typ. Max. Units NotesPower SupplyOperating Voltage VCC2.7 3.3 3.6 VDCTX Sup

– –– –4 5Figure 4: Electrical Specifications250 Series Transceiver SpecificationsParameter Symbol Min. Typ. Max. Units NotesInterface SectionInp

– –– –6 7Theory of OperationThe 250 Series transceiver is a low-cost, high-performance synthesized FSK transceiver. Its wideband operation giv

– –– –8 9If acknowledgements are enabled for assured delivery, then once the packet is sent the module looks for an ACK from the other side. I

– –– –10 11Low-Power StatesThe module supports three power saving modes: Standby, Sleep and Deep Sleep. Standby and Sleep are included primari

– –– –12 13Reset to Factory DefaultIt may be necessary to reset the non-volatile registers to their factory defaults. To reset the module, hol