Banner Engineering RM1809 Users Guide
SureCross™ 1 Watt Data Radio
SureCross™ 1 Watt Data Radio
Features
Data radios may be used to expand a Modbus network or avoid obstacles in the path of
the radio signals.
Wireless industrial device to extend the range of a Modbus network
•
+10 to 30V dc power input
•
Data routing controlled by Modbus slave IDs
•
Radio networks use unique network IDs
•
Frequency Hopping Spread Spectrum (FHSS) technology and Time Division
•
Multiple Access (TDMA) control architecture combine to ensure reliable data
delivery within the unlicensed Industrial, Scientific, and Medical (ISM) bands
Transceivers provide two-way communication between radios
•
For additional information and a complete list of accessories, including FCC approved
antennas, please refer to Banner Engineering’s website, www.bannerengineering.com/
surecross.
Models
Model Power Frequency Master/Slave Serial Type
DX87M9S2
DX87S9S42 Slave
DX87M9S4 Master
DX87S9S4 Slave
DX87M2S2
DX87S2S42 Slave
DX87M2S4 Master
DX87S2S4 Slave
WARNING…
Never use these products for personnel protection. Doing so could lead to serious injury or death.
These products do NOT include the self-checking redundant circuitry necessary to allow their use in personnel safety
applications. A failure or malfunction can cause either an energized or de-energized product output condition. Consult your
current Banner Safety Products catalog for safety products that meet OSHA, ANSI, and IEC standards for personnel protection.
Printed in USA 10/07 P/N 132031
Not to be used for personnel protection
10 to 30V dc
900 MHz ISM Band
2.4 GHz ISM Band
Master
Master
RS232
RS485
RS232
RS485
SureCross™ 1 Watt Data Radio
NID A
NID A
NID A
NID 1
NID 1
NID 1
NID 2
NID 2
NID 2
Modbus
Master
Overview
Serial radios connect a Modbus control system to one or more DX80 Gateway devices acting as Modbus slaves. The data radios do not
use addressing, error checking, or acknowledgement in the radio packets. Instead, the data stream appearing on the serial input of one
radio within the network is reproduced on the serial outputs of all other radios in the same network. Addressing and error connection
occur at the application layer. The system operates as it would in a hardwired Modbus multi-drop serial network.
All deterministic properties of the DX80 star networks are preserved. If a data radio linkage drops multiple packets, the target DX80
Gateway reacts as if the serial line was cut, driving all outputs in the local TDMA system to the predefined state. The data radio links are
collision free because the master control system uses polling to initiate all data exchanges so all data radio packets originate from the
same place.
Each DX80 TDMA cluster is inherently collision free. The only potential collisions occur when hardwired DX80 Gateway devices and
data radios are collocated. Fortunately, the application layer (Modbus) retries the packet until it succeeds. Using 2.4 GHz radios in the
local TDMA links and 900 MHz in the data radio links (or vice versa) also minimizes data collisions.
2 P/N 132031
Banner Engineering Corp. • Minneapolis, MN U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
SureCross™ 1 Watt Data Radio
NID A
NID A
NID A
NID 1
NID 1
NID 1
NID 2
NID 2
NID 2
Modbus
Master
NID B
NID B
NID 3
NID 3
NID 3
This concept can be expanded indefinitely by chaining independent data radio connections through the serial interface. Very large
networks can be created without complex network addressing. Modbus networks can be extended almost without limit while still
maintaining the determinism and latency of the underlying TDMA networks.
Banner Engineering Corp. • Minneapolis, MN U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
P/N 132031 3
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