MDR210A-485 900 MHz. Frequency Hopping RS-485 Master/Slave auto-sensing radio interface. Black Box Corporation – Lawrence, PA - http://www.blackbox.
Table of Contents Description………………………………………………………………3 Features………………………………………………………………….4 Serial Port Scanning…………………………………………………5 Application Fields…………………………………………………….5 Networks…………………………………………………………………5 Module Address………………………………………………………..6 Data Validity…………………………………………………………6, 7 Glossary……………………………………………………………….7, 8 Application Notes………………………………………………..9, 10 Appendix A—Specifications..…………………………………….11 FCC Compliance…………….….…………………………………….
Description The MDR210A-485 uses an embedded 100-milliwatt, frequency-hopping wireless modem that provides communication between a local RS485 network and a remote network of RS485 connected devices. The MDR210A-485 will automatically sense the direction of data flow and switch the RS485 and Radio devices accordingly.
Features resRS485 Master/Slave auto-sensing radio interface. • • Built in 900MHz frequency hopping radio for long-range General Purpose wireless interface. 900 MHz. Spread Spectrum Frequency Hopping Transceiv Provides remote capability to RS485 Modbus networks. Automatically senses Master or Slave data flow. Multiple radios allow many remote RS485 networks to coexist logically. Provides means to connect legacy RS485 devices to wireless. Range Indoor: 600’ to 1300’ Range Outdoor: 7mi. with dipole, >20 mi.
9XSTREAM-192/96 Radio Introduction The 9XSTREAM-192/96 radio is a 100-milliwatt frequency hopping wireless modem that communicates with other equipment using a standard 19200 or 9600-baud asynchronous serial data stream. The radio is half-duplex and can sustain a continuous data stream at the specified data rate. The 9XSTREAM operates within the 900 MHz ISM Band under Part 15 of the FCC Rules and Regulations.
9XStream Frequency Hopping Data Radio FCC Compliance Warning: Changes or modifications to the 9XStream Data Radio not expressly approved by MaxStream, Inc. could void the user’s authority to operate this product. Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation.
Antenna Antenna Connector MMCX Female Antenna Impedance 50 Ohms unbalanced Approved Antennas Integral wire antenna (factory installed) Astron AXQ9PRLMMCX – 1/4 wave flexible whip Astron AXH900 RP SMAR – 1/2 wave flexible whip, SMA Serial Port Scanning The Scan Function is provided to assist the user when they are unsure which communication port the MDR210A-485 is attached to or what baud rate it has been set to.
hop in a different sequence) the two modules will jump to separate channels on the next hop. Using networks, multiple module pairs can operate in the same vicinity with minimal interference from each other. The network parameter is user-definable using the MDR210A-485 Set-up Hop Table. Module Address Module Addresses provide another level of addressing among the MDR210A-485 modules.
Figure 2a – Generation of Data Packets Data Validity (Cont.) Header Data from Buffer Data CRC No Data To Idle Mode Figure 2b – Transmit Mode Description To verify data integrity, a 16-bit cyclic redundancy check (CRC) is computed for the transmitted data and attached to the end of each data packet before transmission. The receiver will then compute the CRC on all incoming data. Any received data that has an invalid CRC is discarded.
Data Packets – A grouping of data to be sent over-the-air. Each data packet contains a header and data that is collected from the data buffer. The size of the packets varies up to 64 bytes depending on how many bytes of data are in the data buffer. Glossary (cont.) Frequency Hopping Spread Spectrum (FHSS) – Method employed by the MDR210A485 module which involves transmitting data over several different channels in a specific channel hopping sequence known by the transmitter and the receiver(s).
Application Notes Why does Sensitivity Matter? Receiver sensitivity is the lowest power level at which the receiver can detect a wave and demodulate data. Sensitivity is purely a receiver specification and is independent of the transmitter. As the wave propagates away from the transmitter, it attenuates as the distance increases. Lowering the sensitivity on the receiver (making it more negative) will allow the radio to detect weaker signals, and thus increase the transmission range.
Application Notes (cont.) Range (meters) Received Power 100 500 1000 3000 5000 8000 10000 11265 (7miles) 12000 -68.526 dBm -82.506 dBm -88.526 dBm -92.048 dBm -102.506 dBm -106.588 dBm -108.526 dBm Detectable by Detectable by MDR210A-485 Commercial Radio YES YES YES YES YES YES YES NO YES NO YES NO YES NO -109.559 dBm -110.805 dBm YES NO NO NO Since the range doubles every 6dB, the 20dB sensitivity difference in radios corresponds to 2^(20/6) = 10.
Appendix A – Specifications General Frequency Range 902 to 928 MHz, unlicensed ISM Band Frequency Hopping Spread Spectrum Type Transceiver Frequency Control Direct FM Transport Protocol Transparent Networking Hops through 25 channels. Up to 65,000 Channel Capacity NetIDs.
FCC Compliance Warning: Warning: This device complies with part 15 of the FCC Rules. Operation is subject to the following conditions: 1. This device may not cause harmful interference, and 2. This device must accept any interference received, including interference that may cause undesired operation.
