Digi 9XCite User manual

Brand: Digi

Model: 9XCite

Category: Radio frequency (RF) modems

Type: User manual

This manual is also suitable for

9XCite-PKG

MaxStream

355 South 520 West, Suite 180

Lindon, UT 84042

Phone: (801) 765-9885

Fax: (801) 765-9895

rf-xperts@maxstream.net

www.MaxStream.net (live chat support)

9XCite-PKG-R™ RS-232/485 RF Modem

9XCite RS-232/485 RF Modem

Interfacing Protocol

RF Modem Operation

RF Modem Configuration

Advanced Networking

Appendices

Product Manual v2.1

For RF Modem Part Numbers: XC09-009PKC-R…

XC09-038PKC-R…

Low Power, Low Cost Boxed RF Modems by MaxStream, Inc.

M100103

2007.01.04

9XCite‐PKG‐R™RS‐232/485RFModem‐ProductManualv2.1[2007.01.04]

©2007MaxStream,Inc. ii

Nopartofthecontentsofthismanualmaybetransmittedorreproducedinany

formorbyanymeanswithoutthewrittenpermissionofMaxStream,Inc.

XCite™andXCite‐PKG‐R™aretrademarksofMaxStream,Inc.

TechnicalSupport: Phone:(801)765‐9885

LiveChat:www.maxstream.net

E‐mail:rf‐[email protected]

Contents

9XCite‐PKG‐R™RS‐232/485RFModem–ProductManualv2.1[2007.01.04]

©2007MaxStream,Inc. iii

1. 9XCite RS-232/485 RF Modem 4

1.1. Key Features 4

1.1.1. Worldwide Acceptance 4

1.2. Specifications 5

1.3. External Interface 6

2. Interfacing Protocol 7

2.1. RS-232 Operation 7

2.1.1. DIP Switch Settings and Pin Signals 7

2.1.2. Wiring Diagrams 8

2.2. RS-485 (2-wire) Operation 9

2.2.1. DIP Switch Settings and Pin Signals 9

2.2.2. Wiring Diagram 9

2.3. RS-485 (4-wire) & RS-422 Operation 10

2.3.1. DIP Switch Settings and Pin Signals 10

2.3.2. Wiring Diagrams 10

3. RF Modem Operation 12

3.1. Serial Communications 12

3.1.1. RS-232 and RS-485/422 Data Flow 12

3.1.2. Serial Data 12

3.2. Modes of Operation 13

3.2.1. Idle Mode 13

3.2.2. Transmit Mode 13

3.2.3. Receive Mode 14

3.2.4. Sleep Modes 15

3.2.5. Command Mode 17

4. RF Modem Configuration 18

4.1. Command and Parameter Types 18

4.1.1. AT Commands 18

4.1.2. Non-AT Settable Parameters (X-CTU Soft-

ware configurable only) 18

4.2. Configuration Software 19

4.2.1. Installation 19

4.2.2. Serial Communications Software 19

4.3. Command Reference Tables 20

4.4. Automatic DIP Switch Configurations 22

4.5. Command Descriptions 23

5. Advanced Networking 32

5.1. Addressing 32

5.1.1. Vendor Identification Number (ATID) 32

5.1.2. Channel (ATHP) 33

5.1.3. Destination Address (ATDT) and Address

Mask (ATMK) 33

Appendix A: Agency Certifications 35

FCC (United States) Certification 35

Labeling Requirements 35

FCC Notices 35

Limited Modular Approval 36

FCC-approved Antennas 36

IC (Industry Canada) Certification 37

Labeling Requirements 37

Appendix B: Additional Information 38

1-Year Warranty 38

Ordering Information 38

Contact MaxStream 39

9XCite‐PKG‐R™RS‐232/485RFModem–ProductManualv2.1[2007.01.04]

©2007MaxStream,Inc.

1.9XCiteRS‐232/485RFModem

The XCite-PKG-R RS-232/485 RF Modem pro-

vides OEMs and system integrators with a low

power wireless solution that is easy-to-use.

No configuration is necessary for out-of-box RF

operation. Simply feed data into one modem;

then the data is sent out the other end of the

wireless link. If more advanced functionality is

needed, the modem support an extensive set of

commands.

The RF modem operates within the ISM 900

MHz frequency band.

1.1. Key Features

Long Range Data Integrity

4 mW Power Output (0 dBm)

• Indoor/Urban: up to 300' (90 m)

• Outdoor RF line-of-sight:

up to 1000' (300 m) w/ 2.1 dB dipole antenna

Receiver Sensitivity

• -108 dBm (@ 9600 baud),

• -104 dBm (@ 38400 baud)

Advanced Networking & Security

True Peer-to-Peer (no "master" required),

Point-to-Point & Point-to-Multipoint networking

Hopping (Frequency Hopping Spread Spectrum)

or Single Frequency Modes

7 hopping channels: each with over 65,000

network addresses available

Up to 9 non-overlapping simultaneous networks

Low Power

Power-down current as low as 1 mA

105 mA transmit / 55 mA receive current

consumption

Easy-to-Use

No configuration required

Advanced configurations available through

commands

7 to 18V power supply

Continuous RF data stream of

up to 38.4 kbps

XII™ Interference Immunity

X-CTU Software included

Cover more ground with fewer radio

modems due to market-leading range

Free & Unlimited Technical Support

1.1.1. Worldwide Acceptance

FCC Certified (USA) [Refer to Appendix A for FCC Requirements]

Systems that contain XCite Modems inherit MaxStream's FCC Certification

IC (Industry Canada) Certified

ISM (Industrial, Scientific & Medical) license-free 902-928 MHz frequency band

Manufactured under ISO 9001:2000 registered standards

9XCite‐PKG‐R™RS‐232/485RFModem–ProductManualv2.1[2007.01.04]

©2007MaxStream,Inc.

1.2. Specifications

Table1‐01. 9XCite‐PKG‐RRS‐232/485RFModem

9XCite 900 MHz RS-232/485 RF Modem Specifications

Performance

Transmit Power Output 4mW

Indoor/Urban Range Up to 300’ (90 m)

Outdoor

RF line-of-sight Range

Up to 1000’ (300 m)

Interface Data Rate

(software selectable using BD command)

1200 –57600 bps

Throughput Data Rate (baud) 9600 bps 38400 bps

RF Data Rate (baud) 10,000 bps 41,666 bps

Receiver Sensitivity -108 dBm -104 dBm

Power Requirements

Supply Voltage 7 - 18 VDC

Transmit Current 105 mA

Receive Current 55 mA

Power-down Current < 1 mA

Networking & Security

Frequency 902-928 MHz

Spread Spectrum Frequency Hopping, Wide band FM modulator

Modulation FSK (Frequency Shift Keying)

Network Topologies Supported Peer-to-Peer (“Master/Slave” relationship not required), Point-to-Point & Point-to-Multipoint

Channel Capacity

Hopping Mode - 7 hop sequences share 25 frequencies

Single Frequency Mode - 25 available frequencies

Physical Properties

RF Modem Board Size 2.75" x 5.50" x 1.124" (7.90 cm x 13.90 cm x3.80 cm)

Weight 7.1 oz. (200 g), Extruded aluminum, black anodized

Serial Connector DB-9

Operating Temperature 0 to 70º C (commercial)

Antenna

Connector RPSMA (Reverse-polarity SMA)

Type Half-wave dipole whip, 6.75” (17.15cm), 2.1 dBi gain

Impedance 50 ohms unbalanced

Certifications (partial list)

FCC Part 15.247 OUR-9XCITE

Industry Canada (IC) 4214A-9XCITE

9XCite‐PKG‐R™RS‐232/485RFModem–ProductManualv2.1[2007.01.04]

©2007MaxStream,Inc.

1.3. External Interface

Figure1‐03. DIPSwitchSettings

1-01a. Power Switch

Figure1‐01. FrontView

Move Power Switch to the ON (up) position to power the XCite RS-

232/485 RF Modem.

1-01b. I/O & Power LEDs

LEDs indicate modem activity as follows:

Yellow (top LED) = Serial Data Out (to host)

Green (middle) = Serial Data In (from host)

Red (bottom) = Power/TX Indicator (Red light is on when

powered; it pulses on/off briefly during RF transmission.)

1-01c. DB-9 Serial Port

Standard female RS-232 (DB-9) DCE connector - Port is also used for

RS-485 and RS-422 connections.

1-01d. Power Connector*

7-18 VDC Power Connector (Center positive, 5.5/2.1 mm) - Power

can also be supplied through Pin 9 of the serial port.

1-02a. DIP Switch

Figure1‐02. BackView DIP Switch automatically configures the XCite Module to operate in

different modes. Each time the RF modem is powered-on, intelligence

on the XIB-R interface board programs the embedded module accord-

ing to the positions of the DIP Switch. [See the figure below for DIP

Switch settings.]

In cases where AT Commands should not be sent each time the RF

Modem is powered on, the processor must be disabled by populating

J7 on the interface board. [See "Automatic DIP Switch Configura-

tions" section for more information].

1-02b. Config (Configuration) Switch

Configuration Switch provides an alternate way to enter "AT Com-

mand Mode". To enter "AT Command Mode" at the RF modem's

default baud rate, hold the Configuration Switch down while powering

on the modem using the Power Switch.

1-02c. Antenna Port

This port is a 50 Ohm RF signal connector for connecting to an RPSMA

(Reverse Polarity SMA) type antenna. The RPSMA has threads on the

outside of a barrel and a male center conductor.

1‐01a. Power

Switch

1‐01b. LEDs:

Yellow(top)

Green(middle)

Red(bottom)

1‐01c. DB‐9

Serial Port

1‐01d. Power

Connector

1‐02a.DIP

Switch

1‐02b. Configuration

Switch

1‐02c. Antenna

Port

9XCite™RS‐232/485RFModem–ProductManualv2.1[2007.01.04]

©2007MaxStream,Inc. 7

2.InterfacingProtocol

The 9XCite RS-232/485 RF Modem supports the following interfacing protocols:

• RS-232

• RS-485 (2-wire) Half-duplex

• RS-485 (4-wire) and RS-422

2.1. RS-232 Operation

2.1.1. DIP Switch Settings and Pin Signals

*The‘PinReferenceName’providesanassociativetagthatreferencescommandsusedtodefinepinbehaviors.

GPIstandsforʺGeneralPurposeInputʺandGPOstandsforʺGeneralPurposeOutputʺ.Asanexample,theCD

commandisusedtodefinethebehaviorofGPO2(DB‐9pinnumber1).The

‘PinReferenceName’isthename

usedwhenreferringtoXCitecommandsandparameters.

Table2‐01. RS‐232SignalsandtheirimplementationsontheXCiteRFModem

(Low‐assertedsignalsaredistinguishedbyhorizontallineoverpinname.)

DB-9 Pin

RS-232

Name

Pin Reference

Name*

Description Implementation

1 DCD DO2 Data-Carrier-Detect Connected to DSR (pin6)

2 RXD DO Received Data Serial data exiting the RF modem (to host)

3 TXD DI Transmitted Data Serial data entering into the RF modem (from host)

4 DTR DI2 Data-Terminal-Ready Can enable Power-Down on the RF modemy

5 GND - Ground Signal Ground

6 DSR DO2 Data-Set-Ready Connected to DCD (pin1)

RTS

CMD

DI1

Request-to-Send /

Command Mode

Provides RTS

flow control or enables Command Mode

8 CTS DO1 Clear-to-Send Provides CTS flow control

9 RI - Ring Indicator

Optional power input that is connected internally to the

positive lead of the front power connector

Figure2‐01.

RS‐232DIPSwitchSettings

DIPSwitchsettingsarereadandapplied

onlywhilepowering‐on.

Figure2‐02.

PinsusedonthefemaleRS‐232(DB‐9)

SerialConnector

9XCite™RS‐232/485RFModem–ProductManualv2.1[2007.01.04]

©2007MaxStream,Inc. 8

2.1.2. Wiring Diagrams

Figure2‐03. RS‐232DTEDevice(maleDB‐9connector)wiredtoaDCERFmodem(femaleDB‐9)

Figure2‐04. DCERFmodem(femaleDB‐9connector)wiredtoanRS‐232DCEDevice(maleDB‐9)

Sample Wireless Connection: DTE <--> DCE DCE <--> DCE

Figure2‐05. TypicalwirelesslinkbetweenDTEandDCEdevices

9XCite™RS‐232/485RFModem–ProductManualv2.1[2007.01.04]

©2007MaxStream,Inc. 9

2.2. RS-485 (2-wire) Operation

2.2.1. DIP Switch Settings and Pin Signals

Note: Refer to the figures in the “RS-485/422 Connection Guidelines” section for RJ-45 connector

pin designations used in RS-485/422 environments.

2.2.2. Wiring Diagram

Figure2‐09. XCiteRFModeminanRS‐485(2‐wire)half‐duplexenvironment

Table2‐02. RS‐485(2‐wirehalf‐duplex)signalsandtheirimplementati onsontheXCiteRFModem

DB-9 Pin RS-485 Name Description Implementation

2 T/R- (TRA) Negative Data Line Transmit serial data to and from the RF modem

5 GND Ground Signal Ground

8 T/R+ (TRB) Positive Data Line Transmit serial data to and from the RF modem

9PWR Power

Optional power input that is connected internally

to the front power connector

1, 3, 4, 6, 7 not used

Figure2‐06.

RS‐485(2‐wire)Half‐duplex

DIPSwitchSettings

Figure2‐07.

PinsusedonthefemaleRS‐232(DB‐9)

SerialConnector

Figure2‐08.

RS‐485(2‐wire)w/Termination(optional)

Terminationisthe120ΩresistorbetweenT+andT‐.

DIPSwitchsettingsarereadandapplied

onlywhilepowering‐on.

9XCite™RS‐232/485RFModem–ProductManualv2.1[2007.01.04]

©2007MaxStream,Inc. 10

2.3. RS-485 (4-wire) & RS-422 Operation

2.3.1. DIP Switch Settings and Pin Signals

2.3.2. Wiring Diagrams

Figure2‐13. XCiteRFModeminanRS‐485(4‐wire)environment

Table2‐03. RS‐485/422(4‐wire)SignalsandtheirimplementationsontheXCiteRFModem

DB-9 Pin

RS-485/422

Name

Description Implementation

2T- (TA)

Transmit Negative

Data Line

Serial data sent from the RF modem

3R- (RA)

Receive Negative

Data Line

Serial data received by the RF modem

5 GND Signal Ground Ground

7 R+ (RB)

Receive Positive

Data Line

Serial data received by the RF modem

8T+ (TB)

Transmit Positive

Data Line

Serial data sent from the RF modem

9PWR Power

Optional power input that is connected internally

to the front power connector

1, 4, 6 not used

Figure2‐10.

RS‐485(2‐wire)Half‐duplex

DIPSwitchSettings

Figure2‐11.

PinsusedonthefemaleRS‐232(DB‐9)

SerialConnector

Figure2‐12.

RS‐485(2‐wire)w/Termination(optional)

Terminationisthe120ΩresistorbetweenT+andT‐.

DIPSwitchsettingsarereadandapplied

onlywhilepowering‐on.

9XCite™RS‐232/485RFModem–ProductManualv2.1[2007.01.04]

©2007MaxStream,Inc. 11

Figure2‐14. XCiteRFModeminanRS‐422environmen t

RS-485/422 Connection Guidelines

The RS-485/422 protocol provides a solution for wired communications that can tolerate high

noise and push signals over long cable lengths. RS-485/422 signals can communicate as far as

4000 feet (1200 m). RS-232 signals are suitable for cable distances up to 100 feet (30.5 m).

RS-485 offers multi-drop capability in which up to 32 nodes can be connected. The RS-422 proto-

col is used for point-to-point communications.

Suggestions for integrating the XCite RF Modem with the RS-485/422 protocol:

Figure2‐15. MaleDB‐9toRJ‐45Adapter(yellow)

Figure2‐16. FemaleDB‐9toRJ‐45Adapter(green)

An XCite RS-232/485 RF Modem ‘Accessories Kit’ is available that includes connectors that facilitate

RS-485/422 and other serial communications.

1. When using Ethernet twisted pair cabling: Select wires so that T+ and T- are connected to

each wire in a twisted pair. Likewise, select wires so that R+ and R- are connected to a

twisted pair. (For example, tie the green and white/green wires to T+ and T-.)

2. For straight-through Ethernet cable (not cross-over cable) - The following wiring pattern

works well: Pin3 to T+, Pin4 to R+, Pin5 to R-, Pin6 to T-

3. Note that the connecting cable only requires 4 wires (even though there are 8 wires).

4. When using phone cabling (RJ-11) - Pin2 in the cable maps to Pin3 on opposite end of

cable and Pin1 maps to Pin4 respectively.

9XCite‐PKG‐R™RS‐232/485RFModem–ProductManualv2.1[2007.01.04]

©2007MaxStream,Inc. 12

3.RFModemOperation

3.1. Serial Communications

3.1.1. RS-232 and RS-485/422 Data Flow

The XCite RF Modem can enable a host device to communicate wirelessly. To transmit, the host

device simply sends serial data to the XCite RF Modem pins. The RF modem then converts the data

into FCC-approved RF data. Once transmitted, the RF data can be detected by receiving XCite RF

Modems, checked for integrity and then sent to a receiving device.

Figure3‐01. DataFlowinRS‐232andRS‐485/422environments.

(Low‐assertedsignalsdistinguishedwithahorizontallineoversignalname.)

3.1.2. Serial Data

Data enters the MaxStream RF modem through the DI Pin as an asynchronous serial signal. The

signal should idle high when no data is being transmitted.

The UART performs tasks (such as timing and parity checking) needed for communication. Serial

communication consists of two UARTs which must be configured with compatible parameters

(Baud rate, parity, start bits, stop bits, data bits) to have successful communication. Each data

packet consists of a start bit (low), 8 data bits (least significant bit first) and a stop bit (high). The

following figure illustrates the serial bit pattern of data passing through the modem.

Figure3‐02. Serial(UART)datapacket0x1F(decimalʺ31ʺ)astransmittedthroughtheXCiteModule

DataFormatis8‐N‐1(8bits‐NoParity‐1StopBit)

In the example above, the MaxStream RF modem transfer 8 bits over-the-air [Selectable using BI

(Number of Bits) Parameter]. Start and stop bits of the UART signal are not transmitted over-the-

air, but are regenerated by the receiving modem

9XCite‐PKG‐R™RS‐232/485RFModem–ProductManualv2.1[2007.01.04]

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3.2. Modes of Operation

XCite RF Modems operate in five modes.

Figure3‐03. ModesofOperation

3.2.1. Idle Mode

When not receiving or transmitting data, the RF modem is in Idle Mode. The modem shifts into the

other modes of operation under the following conditions:

• Transmit Mode (Serial data is received in the DI Buffer)

• Receive Mode (Valid RF data is received through the antenna)

• Sleep Mode (Sleep Mode condition is met)

• Command Mode (Command Mode Sequence is issued)

3.2.2. Transmit Mode

When the first byte of serial data comes through the DI Pin and arrives in the DI Buffer, the

modem transitions into Transmit Mode. Once in Transmit Mode, the modem initializes a communi-

cations channel. During channel initialization, incoming serial data accumulates in the DI buffer.

After the channel is initialized, data in the DI buffer is grouped into packets (up to 64 bytes in each

packet) and is transmitted. The modem continues to transmit data packets until the DI buffer is

empty. Once transmission is finished, the modem returns to Idle Mode. This progression is shown

below:

Figure3‐04. Transmissionofdata

9XCite‐PKG‐R™RS‐232/485RFModem–ProductManualv2.1[2007.01.04]

©2007MaxStream,Inc. 14

3.2.3. Receive Mode

If a modem detects RF transmitted data while operating in Idle Mode, it transitions into Receive

Mode to start receiving packets. Once a packet is received, it goes through the receiving-end of a

CRC (cyclic redundancy check) to ensure that the data was transmitted without error. If the CRC

data bits on the incoming packet are invalid, the packet is discarded. If the CRC is valid, the packet

is placed the DO Buffer. This process is shown in the figure below:

Figure3‐05. ReceiveModeDataFlow

The modem returns to Idle Mode after valid data is no longer detected or once an error is detected

in the received data. If serial data-to-transmit is stored in the DI buffer while the modem is giving

precedence to Receive Mode, the data will be transmitted after the modem finishes receiving data

and returns to Idle Mode.

9XCite‐PKG‐R™RS‐232/485RFModem–ProductManualv2.1[2007.01.04]

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3.2.4. Sleep Modes

Software Sleep

Sleep Modes enable the modem to enter states of low-power consumption when not in use. Three

software Sleep Modes are supported:

• Pin Sleep (Host Controlled)

• Serial Port Sleep (Wake on Serial Port activity)

• Cyclic Sleep (Wake on RF activity)

In order to enter Sleep Mode, one of the following conditions must be met (in addition to the

modem having a non-zero SM parameter value):

Once in Sleep Mode, the radio modem does not transmit or receive data until it first returns to Idle

Mode. The return into Idle Mode is triggered by the de-assertion of the Sleep pin or the arrival of a

serial byte through Data In pin.

The SM (Sleep Mode) command is central to setting all Sleep Mode configurations. By default,

Sleep Modes are disabled (SM = 0) and the modem remains in Idle/Receive Mode. When in this

state, the modem remains constantly ready to respond to serial or RF activity.

Pin Sleep (SM = 1)

• Pin/Host-controlled

<Lowest Power Configuration> In order to achieve this low-power state, Pin 2 must be asserted

(high). The modem remains in Pin Sleep until the Sleep pin is de-asserted. The modem will com-

plete a transmission or reception before activating Pin Sleep.

After enabling Pin Sleep (SM (Sleep Mode) Parameter = 1), Pin 2 controls whether the XCite Mod-

ule is active or in Sleep Mode. When Pin 2 is asserted (high), the modem transitions to Sleep Mode

and remains in its lowest power-consuming state until the Sleep pin is de-asserted. The XCite

Module requires 40ms to transition from Sleep Mode to Idle Mode. Pin 2 is only active if the

modem is setup to operate in this mode; otherwise the pin is ignored. Once in Pin Sleep Mode,

CTS

is de-asserted (high), indicating that data should not be sent to the modem. The PWR pin is

also de-asserted (low) when the modem is in Pin Sleep Mode

Note: The modem will complete a transmission or reception before activating Pin Sleep.

Serial Port Sleep (SM = 2)

• Wake on serial port activity

Serial Port Sleep is a Sleep Mode setting in which the modem runs in a low power state until data

is detected on the DI pin.

When Serial Port Sleep is enabled, the modem goes into Sleep Mode after a user-defined period of

inactivity (no transmitting or receiving of data). This period of time is determined by ST (Time

before Sleep) Command. The modem returns to Idle Mode once a character is received through

the DI pin.

Cyclic Sleep (SM = 3-8)

Cyclic Sleep is the Sleep Mode setting in which the XCite Module enters into a low power state and

awakens periodically to determine if any transmissions are being sent.

When Cyclic Sleep settings are enabled, the XCite Module goes into Sleep Mode after a user-

defined period of inactivity (no transmission or reception on the RF channel). The user-defined

period is determined by ST Parameter. [See ST (Time before Sleep) Parameter]

While the modem is in a low-power state, CTS

de-asserted (high) to indicate that data should not

be sent to the modem during this time. When the modem awakens to listen for data, CTS

asserted and any data received on the DI Pin is transmitted. The PWR pin is also de-asserted (low)

when the modem is in Cyclic Sleep Mode. These pins are asserted each time the modem cycles

1. The modem is idle (no data transmission or reception) for the amount of time defined by

the ST (Time before Sleep) parameter.

2. SLEEP pin is asserted.

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into Idle Mode to listen for valid data packets and de-asserts when the modem returns to Sleep

Mode.

The modem remains in Sleep Mode for a user-defined period of time ranging from 0.5 seconds to

16 seconds (SM Parameters 3 through 8). After this interval of time, the modem returns to Idle

Mode and listens for a valid data packet for 100 ms. If the modem does not detect valid data (on

any frequency), the modem returns to Sleep Mode. If valid data is detected, the modem transi-

tions into Receive Mode and receives the incoming packets. The modem then returns to Sleep

Mode after a Period of inactivity that is determined by ST "Time before Sleep" Parameter.

The modem can also be configured to Wake-up from cyclic sleep when the SLEEP pin is de-

asserted (low). To configure a modem to operate in this manner, PW (Pin Wake-up) Command

must be issued. Once the Sleep pin is de-asserted, the modem is forced into Idle Mode and can

begin transmitting or receiving data. It remains active until no data is detected for the period of

time specified by the ST parameter, at which point it resumes its low-power cyclic state.

Note: The cyclic interval time defined by SM (Sleep Mode) Command must be shorter than the interval

time defined by LH ("Wake-up Initializer Timer") Command. For example: If SM=4 (Cyclic 1.0 second

sleep), the LH Parameter should equal 0xB ("1.1" seconds). With these parameters set, there is no risk

of the receiving modem being asleep for the duration of the wake-up initializer transmission. The fol-

lowing section "Cyclic Scanning" explains in further detail the relationship between "Cyclic Sleep" and

"Wake-up Initializer Timer"

Cyclic Scanning. Each RF transmission consists of a wake-up initializer and payload data. The

wake-up initializer contains initialization information and all receiving modems must Wake-up dur-

ing the wake-up initializer portion of data transmission in order to synchronize with the transmitter

and receive the data.

The cyclic interval time defined by the SM (Sleep Mode) command must be shorter than the interval

time defined by LH (Wake-up Initializer Timer) command.

Figure3‐06. CorrectConfiguration(LH>SM):

Thelengthofthewake‐upinitializerexceedsthetimeintervalofCyclicSleep.Thereceiveris

guaranteedtodetectthewake‐upinitializerandreceivetheaccompanyingpayloaddata.

9XCite‐PKG‐R™RS‐232/485RFModem–ProductManualv2.1[2007.01.04]

3.2.5. Command Mode

AT Command Mode provides access to AT-Settable parameters. These parameters extend flexibil-

ity in configuring modems to fit specific design criteria such as networking modems. Not all of the

parameters in the XCite Module can be adjusted using AT Commands.

AT Command Mode

To Enter AT Command Mode:

Default AT Command Mode Sequence (for transition to Command Mode):

• No characters sent for one second [refer to the BT (Guard Time Before) Command]

• Input three plus characters (“+++”) within one second

[refer to the CC (Command Sequence Character) Command.]

• No characters sent for one second [refer to the AT (Guard Time After) Command.]

All of the parameter values in the sequence can be modified to reflect user preferences.

To Send AT Commands:

Figure3‐07.SyntaxforsendingATCommands

To read a parameter value stored in the modem register, leave the parameter field blank.

The preceding example would change the modem’s Destination Address to "0x1F". To store the

new value to non-volatile (long term) memory, the Write (ATWR) command must subsequently be

sent before powering off the modem.

System Response. When a command is sent to the modem, the modem will parse and execute

the command. Upon successful execution of a command, the modem returns an “OK” message. If

execution of a command results in an error, the modem returns an “ERROR” message.

To Exit AT Command Mode:

For an example of programming the RF modem using AT Commands and descriptions of each config-

urable parameter, refer to the "RF Modem Configuration" chapter.

1. Send the 3-character command sequence "+++" and observe guard times before and after

the command characters. [refer to ‘Default AT Command Mode Sequence’ below.] The ‘Ter-

minal’ tab (or other serial communications software) of the X-CTU Software can be used to

enter the sequence.

[OR]

2. Assert (low) the CONFIG

pin and turn the power going to the RF modem off and back on. To

achieve this result, simultaneously press the Reset and Config switches [Figure 1-02];

release the Reset Switch; then after 1 second, release the Config Switch. The RF Modem

then enters AT Command Mode at the modem's default baud rate

Send AT commands and parameters using the syntax shown below.

1. If no valid AT Commands are received within the time specified by CT (Command Mode

Timeout) Command, the modem automatically returns to Idle Mode.

[OR]

2. Send ATCN (Exit Command Mode) Command.

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4.RFModemConfiguration

The following versions of the XCite RF Modem are available:

• 900 MHz, 9600 Baud (RF data rate), Hopping Channel Mode

• 900 MHz, 9600 Baud, Single Channel mode

• 900 MHz, 38400 Baud, Hopping Channel mode

• 900 MHz, 38400 Baud, Single Channel mode

XCite Modems can operate in both Single Channel and Hopping modes. Mode is selectable using

the "Function Set" dropdown list of the "XCite Configuration" tab of the MaxStream-provided X-

CTU Software.

The XCite Module is shipped with a unique parameter set in its memory. Parameters within the set

are organized under the following categories: AT Commands & Non-AT Settable Parameters.

4.1. Command and Parameter Types

4.1.1. AT Commands

AT Commands can be changed at any time by entering AT Command Mode and sending commands

to the modem.

AT Commands can be modified using the any of the following means:

• X-CTU Software "Modem Configuration" tab

• X-CTU Software "Terminal" tab

• Terminal software program (such as "HyperTerminal")

• Microcontroller

4.1.2. Non-AT Settable Parameters (X-CTU Software configurable only)

Non-AT Settable Parameters can only be adjusted using the MaxStream-provided X-CTU Software.

To modify Non-AT Settable Parameter, connect the module to the serial com port of a PC (interface

board is necessary for RS-232 connection) and modify parameter values through the X-CTU Soft-

ware interface. These parameters enable features that need to be set before the module is used in

the field.

Non-AT Settable Parameters can only be modified using the following means:

• X-CTU Software "Modem Configuration" tab

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4.2. Configuration Software

X-CTU is a MaxStream-provided software program used to interface with and configure Max-

Stream RF Modems. The software application is organized into the following four tabs:

• PC Settings tab - Setup PC serial ports for interfacing with an RF modem

• Range Test tab - Test the RF modem's range and monitor packets sent and received

• Terminal tab - Set and read RF modem parameters using AT Commands

• Modem Configuration tab - Set and read RF modem parameters

FigureB‐1. X‐CTUUserInterface(PCSettings,RangeTest, TerminalandModemConfigurationtabs)

NOTE: PC Setting values are visible at the bottom of the Range Test, Terminal and Modem Configura-

tion tabs. A shortcut for editing PC Setting values is available by clicking on any of the values.

Installation

Double-click the "setup_X-CTU.exe" file and follow prompts of the installation screens. This file is

located in the 'software' folder of the MaxStream CD and also under the 'Downloads' section of the

following web page: www.maxstream.net/support/downloads.php

Setup

Serial Communications Software

A terminal program is built into the X-CTU Software. Other terminal programs such as "HyperTer-

minal" can also be used to configure modems and monitor communications. When issuing AT

Commands through a terminal program interface, use the following syntax:

FigureB‐2. SyntaxforsendingATCommands

NOTE: To read a parameter value stored in a register, leave the parameter field blank.

The example above issues the DT (Destination Address) command to change destination address

of the modem to "0x1F". To save the new value to the modem’s non-volatile memory, issue WR

(Write) command after modifying parameters.

To use the X-CTU software, a module assembly (An RF modem mounted to an interface Board)

must be connected to a serial port of a PC.

NOTE: Failure to enter AT Command Mode is most commonly due to baud rate mismatch. The

interface data rate and parity settings of the serial port ("PC Settings" tab) must match those of

the module (BD (Baud Rate) and NB (Parity) parameters respectively).

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4.3. Command Reference Tables

XCite AT Commands [below] and Non-AT Settable Parameters [next page] are organized under the

following

command categories:

• AT Command Mode Options

•Diagnostic

•Networking

• Serial Interfacing

• Sleep Mode (Low Power)

Table4‐01. ATCommands

(Settable/ReadableusingX‐CTUSoftware,serialcommunicationssoftwareormicrocontroller)

Designator

Command Name & Description Parameter Range

Command

Digi 9XCite User manual

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Model: 9XCite

Category: Radio frequency (RF) modems

Type: User manual

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