srm6000.pdf
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Pobierz
Spread Spectrum Radio Modem
for FieldPoint
SRM6000
Wireless FieldPoint-to-PC link
Cables directly to FP-1000
network module
Operates in 902-928 MHz range;
no FCC or DOC license required
Certified for use in U.S., Canada,
and Latin America
Transmits up to 20 miles with
line-of-sight antennas
Superior noise immunity using
Frequency-Hopping Spread
Spectrum technology
Configured for quick setup
-40 to 75°C operating range
Other wireless options for use in
Europe and Asia are available.
Visit
ni.com/info
and enter
wireless
Overview
When wiring is costly or problematic, the SRM6000 radio modem
converts a FieldPoint system into a wireless I/O and data acquisition
system. The SRM6000 is designed specifically for reliable wireless
communications in industrial environments with excellent noise immunity
and range. Because the radio modem uses 902-928 MHz spread
spectrum RF, you can operate the SRM-6000 without an FCC or DOC site
license. The SRM6000 radio modem greatly simplifies the implementation
of wireless systems because it comes configured as a FieldPoint accessory.
The SRM6000 modems are software-
transparent – they work with standard
FieldPoint software and drivers.
EXPRESS
CODES
License-Free RF Communications
The SRM6000 uses Frequency-Hopping
Spread Spectrum (FHSS) for maximum range,
reliability, and interference immunity. The radio
modem operates in the 902-928 MHz band,
which the FCC and DOC have set aside for
license-free operation. The SRM6000 ensures
error-free transmission using frequency hopping and error correction. It
changes frequencies 100 times/s across 112 channels. The RF data
rate is a fast 144 kb/s. Even in severe interference, the modem has
excellent data throughput.
The SRM6000 is capable of communications up to 20 miles line of sight or
even further using repeater modems. Inside most buildings, you can make
connections of several hundred feet without line of sight, even through walls.
For information or to
buy products online,
visit ni.com/catalog
and enter:
srm6000
Wireless FieldPoint System
The SRM6000 radio modem converts a serial (RS-232/RS-485) FieldPoint
system into a wireless I/O system by transparently converting the
FieldPoint RS-232 commands and data into wireless, spread
spectrum communications.
You can configure your wireless FieldPoint system in point-to-point
and point-to-multipoint configurations. A wireless FieldPoint system
includes one master radio modem connected to a PC serial COM port.
At each I/O location, a slave radio modem connects to an FP-1000
network interface module. You can have several slave modems/FP-
1000 FieldPoint I/O locations (see Figure 1). You can also use repeater
radio modems to increase the communications distance or to achieve
line of sight by routing the communications signal around obstructions.
Although you order an SRM6000 configured for operation as a
master, slave, or repeater, you can easily reconfigure the operation
of the radio modem using a PC with a terminal emulator
program, such as HyperTerminal. You can also reconfigure other
communications parameters, such as baud rate, hopping algorithm,
and transmit power.
Antennas and Accessories
While the SRM6000 includes a built-in whip antenna capable of long-
range communications, you may require an external antenna to achieve
line-of-sight operation. Omnidirectional antennas are available with
extension cables up to 100 ft in length. For outdoor installations, you
should install a lightning arrestor on every antenna.
Each radio modem kit includes a 24 VDC wall-mount power
supply. Each master and slave radio configuration includes
the appropriate serial cable to connect the modem to either a PC or
FieldPoint FP-1000 module.
632
National Instruments
Tel: (512) 794-0100 • Fax: (512) 683-9300 • info@ni.com • ni.com
Spread Spectrum Radio Modem
for FieldPoint
Ordering Guide
Worldwide Wireless Solutions
Other wireless options are available for Fieldpoint. The SRM6000 is
currently certified to work in North America only. Other solutions are
available for Europe, Asia, and other parts of the world, as well as
narrow-band solutions. See the latest list of radio wireless solutions for
FieldPoint at
ni.com/info
and enter
wireless
Step 1.
Select the master SRM6000 to a PC host.
Step 2.
For each remote FieldPoint I/O bank, select one slave SRM6000,
which includes a cable for direct connection to the FP-1000 network
interface module. You can also daisy chain additional FieldPoint banks
from the FP-1000 using RS-485 and the FP-1001.
Step 3.
As needed, select repeater modems to increase the transmission
distance or to route communications around obstructions to obtain a
line-of-sight connection.
Step 4
. For each radio modem, determine if an external antenna is
required to achieve line of sight. If needed, select an optional
omnidirectional antenna with maximum cable length of 100 ft.
Master
SRM6000
Slave 2
SRM6000
Repeater
SRM6000
Slave 3
SRM6000
FP-1000
FP-1000
FP-1001
Figure 1: Wireless FieldPoint Topology
Specifications
Data interface.......................... RS-232
RS-232 interface....................... 1.2 to 115.2 kb/s
Frequency range ..................... 902 to 928 MHz (no FCC site license required)
RF output power ..................... 0.1 to 1 W, selectable
Spreading function .................. Frequency hopping 112 channels
Operation................................ Point-to-point, multipoint (unlimited number of slaves)
Maximum range...................... Up to 32 km (20 miles) line of sight, depending on
environment,geograhical conditions, and antenna
Ordering Information
SRM6000
Master ..............................................................777971-01
Slave ................................................................777971-02
Repeater ...........................................................777971-03
Power Requirement
Power voltage ......................... 12 to 38 VDC (120 VAC power supply included)
Power consumption ................ 8 W peak (650 mA at 12 VDC)
Includes radio modem with built-in antenna, power supply,
and either a PC serial cable (master and repeater) or a
FieldPoint serial null-modem cable (slave).
Physical
LED Indicators ......................... Power, carrier, data in, data out
Dimensions ............................. 12.7 by 19.8 by 3.6 cm (5.0 by 7.75 by 1.38 in.)
Weight .................................... 0.8 kg (1.8 lb)
Enclosure................................. All-metal,18-gauge steel, polyurethane paint
Optional Antennas
Omnidirectional antenna with coaxial cable
10 ft..................................................................777985-10
25 ft..................................................................777985-25
50 ft..................................................................777985-50
100 ft..............................................................777985-100
Connectors
RS-232 ..................................... 9-pin female D-Sub
Antenna .................................. Standard-thread SMA
Power ..................................... 2 screw terminals, pluggable
Environment
Operating temperature ........... -40 to 70
o
C
Relative humidity ..................... 0 to 95%, noncondensing
National Instruments
Tel: (512) 794-0100 • Fax: (512) 683-9300 • info@ni.com • ni.com
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