Rice Lake XStream-Pkg Manuale utente

69795

XStream-Pkg

Wireless Modem

Operation

Manual

Contents

1.0 Introduction.................................................................................................................................. 1

2.0 Installation................................................................................................................................... 2

3.0 Operation...................................................................................................................................... 3

3.1 Standby ............................................................................................................................................. 3

3.2 Transmitting ....................................................................................................................................... 3

3.3 Receiving ........................................................................................................................................... 3

4.0 MaxStream Commands ............................................................................................................... 4

4.1 Binary Commands.............................................................................................................................. 4

4.2 AT Commands................................................................................................................................... 4

4.2.1 Entering AT Command Mode ..................................................................................................................... 5

4.2.2 AT Command Response ............................................................................................................................ 5

4.2.3 Reading Parameters from Radio................................................................................................................. 5

4.2.4 Exiting AT Command Mode........................................................................................................................ 5

4.3 Low Power Modes............................................................................................................................. 7

4.3.1 Pin Power Down......................................................................................................................................... 7

4.3.2 Cyclic Power Down .................................................................................................................................... 7

4.3.3 Receiver Power Down ................................................................................................................................ 7

5.0 Networking with the XStream ..................................................................................................... 8

5.1 Vendor IDentification Number (VID)..................................................................................................... 8

5.2 Radio Groups..................................................................................................................................... 8

5.3 Radio ADdress (RAD)......................................................................................................................... 8

5.3.1 RAD Mask.................................................................................................................................................. 8

6.0 Specifications.............................................................................................................................. 9

Speciﬁcations subject to change without notice.

March 2005

Introduction

About This Manual

This manual is intended for use by service technicians

responsible for installing and working with the

MaxStream™ XStream-PKG wireless modem.

Authorized distributors and their employees

can view or download this manual from the

Rice Lake Weighing Systems distributor site

www.rlws.com

1.0 Introduction

The MaxStream XStream-PKG wireless modem is

designed to provide users with an easy to install

wireless communication link between equipment using

a standard asynchronous serial data stream.The modem

can transfer data up to 1/4 mile in a city environment or

greater than seven miles line-of-sight with a directional

antenna. The modem supports 8 data bits, no parity, and

1 stop bit. These settings cannot be changed.

Figure 1-1. MaxStream XStream-PKG Modem

The MaxStream XStream-PKG wireless modem is

perfect for a wide variety of applications ranging from

weighing scales, printer control, data acquisition,

wireless LANs, to instrument monitoring. Features

include:

•Best sensitivity in the industry for extended

transmission range.

•Low power consumption. Suitable for battery

powered applications.

•Easy to integrate. No knowledge of RF necessary.

Simple networking protocol.

•Standard serial digital interface. Interfaces with any

microcontroller or weight indicator.

•Reliable data transfer performance.

•Choice of integral or separate external antennas.

•FCC approved with no further licensing or approval

required.

The radios integrate quickly and seamlessly into any

new or existing design. Output serial data from any

microcontroller, weight indicator, or RS-232 port into

the radio to send FCC approved, frequency hopping

spread spectrum data through the air and capture it on

all receivers within range on the same network. The

system behaves as a virtual half-duplex, parallel-wired

network.

The Maxstream XStream-PKG wireless modem comes

with the following:

• 900 MHz wireless modem

•Power supply

• RS-232 cable

Optional components of the MaxStream include:

• 3" one-quarter wave monopole antenna

• 6" one-half wave dipole antenna

Note:

To comply with the FCC RF exposure requirements, the

MaxStream XStream-PKG can only be used with

approved antennas that have been tested with this

modem and a minimum separation distance of 20 cm

(8") must be maintained from the antenna to any nearby

persons.

The system integrator must also ensure that the

external label (shown below), provided with this device

is placed on the outside of the ﬁnal product.

Figure 1-2. External Label

This device contains transmitter module

FCC: ID: OUR9XTREAM. The enclosed

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 not accept any interference received,

including interference that may cause

undesired operation.

0.60"

1.32"

MaxStream XStream-PKG Wireless Modem Operation Manual

2.0 Installation

This section describes procedures for connecting the MaxStream XStream-PKG wireless modem to a host device.

Immediately after unpacking, visually inspect the modem to ensure that all components are included and

undamaged. The shipping carton contains the modem, power supply, cabling, and this manual.

The MaxStream XStream-PKG wireless modem connects to a host device using a 9 pin RS-232 D-Sub connector.

This connection supplies serial communications hookup. The power supply plugs into a round pin 7-18VDC plug.

The following illustration shows the package endplate.

Figure 2-1. MaxStream XStream-PKG Endplate

Connect the supplied serial communications cable into the 9 D-Sub connector and attach the other end to the host

device. Refer to the following chart for serial connector pinouts.

Attach the optional 3" or 6" antenna to the opposite side of the modem (see antenna location below).

Figure 2-2. Antenna Location

Power up the modem by turning on the ON switch located on the backplate of the modem. LED lights (RX and

PWR/TX) will be lit indicating power to the unit.

In addition, there is a push button on the antenna endplate of the unit. This is a conﬁguration push button. Hold

down the push button while powering up the unit to go into command mode. Placing the unit in command mode

with the push button is similar to using the “+++” command, except the push button forces the unit to use the default

baud rate instead of the current one. The default baud rate for the unit is 9600 and is the only parameter that can be

changed. Data Bits and Parity and Stop Bits cannot be changed. Their default is: Data Bits = 8, Parity = None, Stop

Bits = 1. See Section 4.0 on page 4 for more information about command modes.

Pin Signal Type Description

1NC— No connect

2 RXD Output Data

3 TXD Input Data

4 DTR Input Sleep control

5 SGND Ground Common return

6NC— No connect

7RTS Input Binary program control

8 CTS Output Clear to send control

9NC— No connect

Table 2-1. Serial Connector Pinout Assignments

7-18 VDC

RS-232

PWR/TX

POWER

SWITCH

UP =

Operation

3.0 Operation

There are various operating states associated with the operation of the MaxStream XStream-PKG wireless modem.

The following sections describe the stages of operation.

3.1 Standby

When the radio is not transmitting or receiving, it is in standby mode and ready to receive data. From standby, the

radio can either transmit, if data is presented on the serial port; or receive, if data is presented over the air. The radio

returns to standby when data is no longer present either on the air or on the serial port, or if a receive error is

detected.

3.2 Transmitting

The MaxStream modem leaves standby mode when data is received by the serial port which then sends incoming

data through the air. Once in transmit mode, the modem starts to send buffered data. Data is sent in packets up to 64

bytes long. When the ﬁrst byte is clocked into the transmit buffer, the modem begins the transition from standby to

transmit.The transition between standby mode and transmit mode take approximately 35 milliseconds (ms) which is

the approximate length of time it takes for the modem to receive serial port data and then transmit serial port data.

After the 35ms transition time, any bytes that are in the buffer are packetized and sent over the air.

The MaxStream XStream-PKG can buffer up to 132 characters before it must stop receiving characters. The

modem will de-assert the CTS ﬂow control line when approximately 116 characters have been received to notify the

sending device to stop sending data. When the ﬁrst packet has been transmitted if more bytes are in the buffer, they

are packetized and sent. If the buffer is empty, the modem transitions to standby mode.

3.3 Receiving

If data is present on the airwaves when the modem is in standby, it transitions to the receive mode. In receive mode

it receives a packet and transmits it out the serial port. Received packets are protected from data corruption by a

16-bit CRC. A packet is rejected and not sent out of the serial port if there is an error detected in the packet.

The modem stays in receive mode until no more data is detected or an error is detected.A modem in receiving mode

does not transmit data coming in to the serial port until after returning to standby mode. When there are gaps in

receiving data, the receiver automatically returns to standby mode. If the receiver has buffered data coming in to the

serial port, this data is sent after the modem returns to standby mode.

MaxStream XStream-PKG Wireless Modem Operation Manual

4.0 MaxStream Commands

The MaxStream XStream-PKG is available with advanced power-down and addressing options. These options can

be conﬁgured through either of the two command modes, binary, or AT commands. By default, all data received on

the RX pin is transmitted on the RF channel. The command modes differentiate commands from the data and allow

various operating parameters to be changed. These parameters that are changed can be saved in volatile memory to

be discarded when the modem powers off or is reset, or in non-volatile memory to be saved and used until they are

rewritten again.

4.1 Binary Commands

Send a binary command by asserting the RTS pin (pin 7) high and send the binary bytes that represent a command

and its parameters. Binary command bytes are organized as follows:

A command is one byte long. Parameters are two bytes long. “<” and “>” characters are used to indicate parameters

and are not actually part of the command.

The command type should be sent with RTS asserted. Do not de-assert RTS until after the stop bit of the last byte is

sent. It does not matter whether RTS is asserted when the parameters are sent. The command executes when all the

parameters associated with the command are sent. If all parameters haven’t been sent within 0.5 seconds, the

modem returns to data mode.

Commands can be queried for their current value by sending the command logically ORed with the value 0x80

hexadecimal with RTS asserted. No parameters are sent and the current value of the parameter is immediately sent

out the serial port. If the parameter is 2 bytes long the least signiﬁcant bit is sent ﬁrst.

Note:

When parameters are sent, they are always two bytes long; when they are read they are one or two bytes

long as indicated in the command table shown on page 5.

An example of binary commands include:

To set sleep mode to pin power down and store to non-volatile memory:

•Assert RTS

•Send bytes: 0x01, 0x00, 0x08

•De-assert RTS

4.2 AT Commands

AT commands are accessed through ASCII commands and parameters that can be sent from a terminal program

such as HyperTerminal.AT commands are sent as follows:

•All characters must be ASCII displayable characters

•All alphabetic characters can be sent upper and lower

case

•All parameters must be made from ASCII

hexadecimal characters (0-9, a-f, A-F). Parameters

can be up to four characters long. All parameters are

speciﬁed as hex values.

•Aspace can be any non-alpha-numeric character.

•Carriage return (CR) is a byte value of 13 decimal

(0x0D).

Example:Send the following sequence of characters to change the user-deﬁned address to 1A0D (hex).

+++

ATDT 1A0D<CR>

ATWR<CR>

ATCN<CR>

MaxStream Commands

4.2.1 Entering AT Command Mode

Commands and data are both sent to the same serial UART on the MaxStream modem. A special break sequence

must be sent to get the modem intoAT command mode.After the sequence all subsequent characters are interpreted

as commands and are sent as data.

The default sequence for command mode is:

1. No characters sent for one second (before command character time, change with ATBT).

2. Send three plus characters “+++” (command entry character, change with ATCC).

3. No characters sent for one second (after command character time, change with ATAT).

4. The XStream modem responds by sending an OK<CR>.

The before command character time, after character time and command entry character can all be changed byAT or

binary commands.

4.2.2 AT Command Response

After a recognized and executed AT command the modem responds with an OK<CR>. After unrecognized

commands with bad parameters an ERROR<CR> is sent.

4.2.3 Reading Parameters from Radio

If an AT command is sent without any parameters (carriage return <CR> is still sent), the response is the current

value of that command reported as a hexadecimal number. Example: ATSM<CR> returns the current power down

mode setting.

4.2.4 Exiting AT Command Mode

There are two ways to exit the AT command mode and return to data mode. If no valid AT commands are received

within the AT command time-out (ATCT) time, the modem returns to data mode automatically. Alternatively, the

AT command mode can also be exited by sending theATCN command.

Command Binary

Command # Description Parameters

# Bytes

Returned

For Binary Factory

Default

DT 0 V4.08 Set the Radio ADress (RAD). Only radios

with the same address can communicate. Address from 0-65535 2 0

SM 1 Set power down mode 0 - No sleep mode

1 - Sleep on pin

2 - Wake from serial RX

3 - Cyclic 0.5 second sleep

4 - Cyclic 1.0 second sleep

5 - Cyclic 2.0 second sleep

6 - Cyclic 4.0 second sleep

7 - Cyclic 8.0 second sleep

ST 2 Set time to sleep. Time of inactivity before

entering power down mode (this number is

only valid in RX and cyclic modes).

Number of tenths of seconds. Valid from

1 to 65535. 264

HT 3 Set time before long header. Time of

inactivity on RX pin before a long header is

used.

Number of tenths of seconds. Valid from

0 to 65535. 65535 means no long

header.

2 FFFF

BT 4 Set silence time after command sequence. Number of tenths of seconds.

Valid from 1 to 65535 2A

AT 5 Set silence time after command sequence. Number of tenths of seconds.

Valid from 1 to 65535 2A

CT 6 Set time out from AT command mode.

Causes a return from AT mode after no

valid commands have been received.

Number of tenths of seconds.

Valid from 1 to 65535 2C8

FL 7 Set serial software ﬂow control. Hardware

ﬂow control (CTS) is always on. 0 - No software ﬂow control

1 - Use software ﬂow control 10

Table 4-1. MaxStream Command Table

MaxStream XStream-PKG Wireless Modem Operation Manual

WR 8 Write all conﬁgurable parameters to

non-volatile memory. All setable

parameters are stored.

No parameters NA NA

CN 9 Exit AT command mode No parameters NA NA

E0 10 No echo in AT command mode No parameters NA NA

E1 11 Echo characters in AT command mode No parameters NA NA

LH 12 Transmit beacon time Time in tenths of seconds for the wake up

beacon 11

FH 13 Force beacon on next transmit No parameters NA NA

RE 14 Restore defaults conﬁguration No parameters NA NA

ER 15 Set receive error count Value of error count. This value is reset to

0 after every reset it is not non-volatile 20

GD 16 Set receive good count Value of good count. This value is reset to

0 after every reset it is not non-volatile 2 0

HP 17 Set group number. Each radio group uses

a different hop sequence. Seven different

group numbers available.

Number 0 to 6. Use this parameter to

operate independent networks of

XStream radios in the same vicinity.

1 0

MK 18 Set RAD mask (Radio ADdress mask) Address mask. Only bits set to 1 is used

in the address comparision. A global

address is an address that has the same

bits set as the address mask.

2 FFFF

CC 19 Set command sequence character Number for the command character. Valid

from 32 to 127. 1 2B

VR 20 Firmware version Firmware version 2 NA

BD 21 V4.08 Set UART baud rate Number corresponding to UART baud

rate. Baud rate doesn’t take effect until

ATCN command is issued. If the baud

command is issued in binary mode it

must be stored (ATWR) and a new baud

rate will take affect after reset

1 - 2400

2 - 4800

3 - 9600

4 - 19200

5 - 38400

6 - 57600

RT 22 V4.10 RTS Control 0 - No binary commands accessed with

RTS

1- Binary commands are sent when RTS

is asserted

SY 23 V 4.12 Set sync timer Time in tenths of seconds that the

transmitter and receiver stay in sync after

receiving or sending data. Setting this

parameter to 20 (0x14) will allow any

radio to transmit within the next 2

seconds utilizing a beacon of 8ms instead

of 35ms. Use this parameter to speed up

communication latency and turn-around

time.

Command Binary

Command # Description Parameters

# Bytes

Returned

For Binary Factory

Default

Table 4-1. MaxStream Command Table (Continued)

MaxStream Commands

4.3 Low Power Modes

The MaxStream XStream-PKG wireless modem has several low power modes that enable it to be used in low

power or battery operated environments. While in low power mode, it is only able to check for whatever stimulus

will return the modem to power up mode. No transmitting or receiving can occur.

The power modes and the current usage deﬁnitions are listed below:

4.3.1 Pin Power Down

Pin 4 (pwrdwn), on the 9-pin connector controls whether the MaxStream XStream-PKG is in power up or power

down mode. If pwrdwn is low, the modem is powered up and fully operational. If pwrdwn is high, the modem is in

its lowest power mode. This mode allows the lowest power consumption but also requires the user to completely

control the power up and power down of the modem. The modem requires 20 milliseconds to transition from power

down to power up mode. The pwrdwn pin is only active if the modem is set up to operate in this mode, otherwise the

pin is ignored.

4.3.2 Cyclic Power Down

The modem goes into low power mode after a user-deﬁned period of inactivity (no transmission or reception on the

RF channel). The modem remains in the low power mode for a user-deﬁned period of time ranging from 0.5 to 8

seconds. After this period of time the modem returns to power up mode and scans all RF channels for a valid data

packet. If no data packet is found on any channel, the modem returns to low power mode.

If a data packet is found the modem remains powered up and receives the packet and any following packets until

another inactivity timeout. The modem returns to the low power mode after the inactivity time period.

Note:

The modem requires 35 milliseconds (ms.) to scan all channels. The modem requires 20 milliseconds to transition

from low power to power up mode.

4.3.3 Receiver Power Down

The modem goes into power down after a user-deﬁned period of inactivity on the serial receive channel. The

modem transitions to power up mode when a character is received on the serial receive channel.

Power Mode Description Current

Pin power down An RS-232 input is used to power down the XStream-PKG module < 2 uA

Cyclic power down The modem goes into a low power mode automatically after a deﬁned period of time of

no activity (no received character on the RF channel). 50 uA

Receiver power down The modem powers down automatically after not receiving characters on the serial

channel for a user-deﬁned period of time. Any serial channel received character will

bring the modem to a power up condition.

1 mA

Standby The modem is fully operational and is currently scanning channels for valid data. 50 mA

Transmitting The modem is fully operational and is currently transmitting data. 150 mA

Table 4-2. MaxStream XStream-PKG Power Modes

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