QTM-8524 2.4 GHz RF Radio Modem Module Users Manual WIRELESS MODEM MODULE FOR QTM-8000 SERIES SYSTEMS QUATECH, Inc. 662 Wolf Ledges Pkwy Akron, Ohio 44311 TEL: (330) 434-3154 FAX: (330) 434-1409 http://www.quatech.
QTM-8524 User’s Manual Revision 1.
Warranty Information Quatech Inc. warrants the QTM-8524 to be free of defects for one (1) year from the date of purchase. Quatech Inc. will repair or replace any system component that fails to perform under normal operating conditions in accordance with the procedures outlined in this document, provided the failure occurs during the one year warranty period. Any damage resulting from improper installation, operation or general misuse voids all warranty rights.
Notice The information contained in this document cannot be reproduced in any form without the written consent of Quatech Inc. Any software programs accompanying this document can be used only in accordance with any licensing agreement(s) between the purchaser and Quatech Inc. Quatech Inc. reserves the right to change this documentation or the product to which it refers at any time and without notice. The authors have taken due care in the preparation of this document and any associated software program(s).
Table of Contents 1. Introduction 1.1 1.2 1.3 1.4 Available QTM-8000 Series Modules QTM-8000 Series Common Features QTM-8000 Series Wireless Networks 1.3.1 Disadvantages of Conventional Two-Wire RS-485 Networks 1.3.2 The QTM-8000 Series Network Advantage 1.3.3 Operation Principle 1.3.4 Supporting Multiple Baud Rates QTM-8000 Series Module dimensions 2. QTM-8524 Specifications 2.1 2.2 2.3 2.4 2.5 2.
4. Configuration 4.1 4.2 4.3 4.4 RS-232 or RS-485 Configuration Half-Duplex and Full-Duplex Operation Synchronous and Asynchronous Communication Configuration Modes 4.4.1 Mode 1: Full-Duplex, Synchronous 4.4.2 Mode 2: Half-Duplex, Synchronous 4.4.3 Mode 3: Full-Duplex, Asynchronous 5. Application Examples 5.1 5.2 5.3 5.4 Peer-to-Peer Communication (Mode 1) Interfacing with QTM-8000 Modules (Mode 1) Multiple PC Communication (Mode 2) Asynchronous Communication (Mode 3) 6.
List of Figures 1.3 QTM-8000 Series Network with Multiple Baud Rates and Multiple Data Formats 12 1.3.2.1 Single Baud Rate QTM-8000 Wireless Network 13 1.3.2.2 Multi-Baud Rate Wireless QTM-8000 Network 14 1.4.1 QTM-8000 Series Front, Side, Rear and Top Views 17 1.4.2 QTM-8000 Series DIN Rail Mounting 18 1.4.3 QTM-8000 Series Panel Mounting 19 2.3 QTM-8524 Block Diagram 22 2.4 Disassembling the QTM-8524 23 2.5 QTM-8524 Jumper Settings 25 2.5.
1. Introduction The QTM-8000 Series of modules is comprised of analog and digital I/O modules designed for a wide variety of data acquisition and signal conditioning functions. These modules are designed for an RS-485 communication network, and require an RS-485 to RS-232 converter in order to be accessed through a standard PC serial port. The QTM-8520/8520R module performs this function.
1.1 Available QTM-8000 Series Modules Wireless Radio Modem Modules: QTM-8524: 2.
1.2 QTM-8000 Series Common Features Communication : ❍ Asynchronous half-duplex 2-wire RS-485 network ❍ Maximum network distance without repeater=4000 feet (1.
1.3 QTM-8000 Series Wireless Networks Figure 1.
1.3.1 Disadvantages of Conventional Two-Wire RS-485 Networks: In a standard RS-485 network, a converter is used to adapt the host PC’s single wire RS-232 signal to the two-wire RS-485 signal required by the network. However, when using a standard converter, not only must the baud rate and data format for all signals remain fixed, but they must be identical for all incoming signals.
Figure 1.3.2.
1.3.3 Operation Principle (Refer to Figure 1.3.2.1 & 1.3.2.2): (1) The Host PC sends out a command via COM1. (2) The QTM-8520 or upstream QTM-8524 converts the RS-232 signal into a RS-485 signal or a RF signal respectively. (3) All modules connected to the RS-485 network will simultaneously receive this command. Each module in the network will extract the destination address field and compare this value to its local module address.
1.3.4 Supporting Multiple Baud Rates As noted earlier, QTM-8000 Series networks support devices operating at different baud rates. For example, in Figure 1.3 the diagram depicts a wireless modem operating at 19200 bps, QTM-8000 Series modules operating at 2400 bps and a PLC operating at 9600 bps. The QTM-8520 converter module can automatically switch to any baud rate in the 1200 bps to 115,200 bps range.
1.4 QTM-8000 Series Module Dimensions FRONT VIEW SIDE VIEW Figure 1.4.
Figure 1.4.
Plastic Part for Panel Mount Figure 1.4.
2. QTM-8524 Specifications 11 Pin Assignments 20 2.1 QTM-8524 Wireless RF Modem 10 1 Frequency Range: 2.4 GHz Channel Spacing: 2 MHz RF Power Output: 0.
2.2 QTM-8524 Module Specifications QTM-8524: 2.4 GHz RS-232/RS-485 to RF Converter RF Communication Transceiver Frequency Band: 2426 to 2458 MHz Channel Spacing: 2.048 MHz (8 Channels jumper select) Peak Output Power: 28.5 dBm ±2 dB (.707 watts) Modulation: Gaussian Minimum Shift Keying (GMSK) Time Division Duplexing Transmission Range: RS-232 Line of Sight: .35 miles Semi-Open: 150 ft.
2.3 QTM-8524 Block Diagram Transceiver TX RX D+ RS-232 Interface D- RS-485 Interface +Vs GND Power Regulator GMSK RF Module antenna Embedded Controller +5V QTM-8524 Figure 2.3--QTM-8524 Block Diagram 2.4 QTM-8524 Disassembly Disassembly of the QTM-8524 is required to change the jumper settings. Please refer to figure 2.4 and follow the steps below to disassemble the module: 1. Remove the DIN rail mounting bracket by loosening the screws on the front of the unit. 2.
5. Snap the case back together firmly. 6. Insert the two (2) small screws in the back of the unit. 7. Place the DIN rail bracket back (notice locating pins on the bottom of the bracket) and secure tightly. Remove for disassembly Remove for disassembly REAR VIEW Figure 2.
2.5 QTM-8524 Jumper Settings Factory default jumper settings are indicated below. · · · · · · · Channel 3 Baudrate (bps) = 9600 bps Slave Mode RS-232 Interface Frequency Channel = 2439.936 MHz Full Duplex Mode Synchronous Communication Figure 2.5 on the following page diagrams the other possible jumper settings. See section 4 for more information about how QTM-8524 modules should be configured for different types of QTM-8000 wireless networks.
(1) Channel Select (2) Frequency Select (3) Baud Rate Select Channel0 2426.112 MHz 600 bps Channel1 2430.720 MHz 1200 bps Channel2 2435.328 MHz 2400 bps Channel3 2439.936 MHz 4800 bps Channel4 2444.544 MHz 9600 bps Channel5 2449.152 MHz 19200 bps Channel6 2453.760 MHz 38400 bps Channel7 2458.368MHz 57600 bps (4) (5) Full-Duplex Half-Duplex Slave Master Synchronous QTM-8524 (6) Asynchronous RS-232 (7) RS-485 Figure 2.5.
2.6 QTM-8524 Basic Wire Connections 2.6.1 RS-232 connection between PC and QTM-8524 The QTM-8524 includes a cable that will allow you to connect your wireless module directly to a PC. One end of the cable provides a standard D-9 connector that plugs into a computer’s standard serial port. The other end has exposed wires used for connecting with the QTM-8524. Follow the instructions below to wire the module to the cable.
3. Antennas 3.1 QTM-8524 Antenna Options Two antennas are available for use with the QTM-8524. The standard antenna, QTM-24ANT-SW, is for general purpose indoor/outdoor applications, and can be conveniently wall-mounted on a swivel bracket. The optional monopole antenna, QTM-24ANT-C is ideal for office/lab applications and can be easily mounted on the ceiling. 3.1.1 QTM-24ANT-SW Specifications Standard Wall-Mount Antenna Type: Patch Mount: Swivel bracket Application: General Purpose Gain: 7.
3.1.2 QTM-24ANT-C Specifications Ceiling-Mount Antenna Type: Monopole Mount: Ceiling Frequency: 2.4 GHz Gain: 3dBd Weight: 0.29lb ( 0.64 kg) Height: 9 in (22.9 cm) Nominal Impedance: 50 Ohms VSWR: 1.5:1 nominal Transmission Range: 500 Meters, open line-of-sight (50M with barriers) Radiating Element: Plated copper laminate Enclosure: Polycarbonate Application: Office/lab, drop ceiling, transmission Included Accessories: cable, hardware and connector Figure 3.1.
3.2 Connecting Antennas to QTM-8524 Modules Your QTM-8524 is issued with a high quality communication antenna. To get the maximum performance form your wireless system, please follow the directions and suggestions that follow. 3.2.1 Site Selection Antenna location is extremely important when installing your system. If possible, try to keep the antenna away from any obstructions. Objects and structures made of metal will reduce the efficiency of the antenna.
3.3 Mounting External Antennas To reduce potential radio interference to other users, the antenna type and its gain should be chosen so that the equivalent isotropically radiated power (EIRP) is not more than that required for successful communication. 3.3.1 Mounting the QTM-24ANT-SW Please refer to Figures 3.3.1.1 - 3.3.1.3 and follow the instructions below to mount your QTM-24ANT-SW antenna. Be sure to mount the antenna BEFORE connecting it to the QTM-8524 module.
(1) Route the antenna cable through the mounting plate as shown in Figure 3.3.1. DO NOT snap the antenna to the mounting plate yet. (2) Secure the molded antenna mount to the mounting plate as shown in Figure 3.3.1. 1 Use the #8-32 x 5/8” machine screws and the #8-32 SS/ Nylon hex nut as shown. (3) Snap the antenna into the mounting plate (dashed lines) as shown in Figure 3.3.1.1 (4) Secure the articulated arm to the molded antenna mount using a 1/4-20 x 1-1/4” machine screw, a 1/4” flat washer.
3.3.2 Mounting the QTM-24ANT-C Safety The QTM-24ANT-C antenna has been designed to attach to and hang from standard ceiling panel runners. To prevent personal injury or equipment damage, the antenna must be securely mounted per the following instructions. The QTM-24ANT-C should be professionally installed. Location The location at which the QTM-24ANT-C is mounted is very important. Objects such as metal columns, walls, etc. will reduce efficiency.
Figure 3.3.2.1-- Installing the QTM-24ANT-C Ceiling Mount Bracket Figure 3.3.2.
3.3.3 RF Safety The QTM-8524 has been classified by the FCC as a §15.247 Spread Spectrum Mobile Transmitter. The antennas selected for use with this transmitter were chosen to provide optimum safety when installed properly. Please reference Sections 3.3.3 and 3.3.2 of this manual before installing the antennas. Keep in mind that mounting the antennas higher yields a twofold benefit: better reception and less RF exposure to people in the general vicinity.
Half duplex mode, all modules must have the same baudrate and frequency configuration and all modules must be jumper configured for slave. (See Figure 2.4 for a diagram of QTM-8524 jumper settings.) In Full Duplex systems, transmission and reception can occur simultaneously. For example, device A can send information to device B while at the same time receiving data from device C.
4.4 Configuration Modes Mode 1 : FULL DUPLEX, SYNCHRONOUS Peer-to-peer communication One QTM-8524 configured for MASTER One QTM-8524 configured for SLAVE.
4.4.1 Mode 1: Full Duplex, Synchronous Mode 1 is the most common form of peer-to-peer communication. In this mode, a module first encodes the input data streams. Then, it transmits the data to the downstream QTM-8524 module. The receiving module decodes the data stream and drives the data onto the serial communication lines. In Mode 1, the QTM-8524 modules are configured for full duplex mode and synchronous communication.
4.4.2 Mode 2: Half-Duplex, Synchronous Mode 2 enables communication between two or more QTM-8524 modules. This allows a single QTM-8524 connected to a PC to communicate with multiple other remote QTM-8524 modules also connected to PCs or PLCs. In mode 2, a single QTM-8524 modules broadcasts signals to every other QTM8524 module in the network. These modules receive the information, interpret the data, and respond accordingly.
4.4.3 Mode 3: Full Duplex, Asynchronous Using Mode 3, QTM-8524 modules can be used to transmit data in any format. In Mode 3, only point-to-point communication is permitted. Both QTM-8524 modules must be configured for full-duplex mode and RS-232 communication, and must share the same frequency. In this mode channel selection is ignored and baud rate need not be synchronized. However, baud rate must be kept under 14.4 kbps. This is because data waveforms may be distorted using data ratesgreater than 14.
5. Application Examples 5.1 Peer-to-Peer Communication (Mode 1) RS-232 RS-232 QTM-8524 QTM-8524 Configuration: QTM-8524 QTM-8524 Configuration: Interface: RS-232 Interface: RS-232 Full Duplex Full Duplex Synchronous Synchronous Master Slave Baudrate: 19200 bps MAX Baudrate: 19200 bps MAX Channel: 1 Channel: 1 Figure 5.1-- Peer-to-Peer Communication Figure 5.1 above depicts a basic serial full-duplex communication application.
5.2 Interfacing with QTM-8000 Modules (Mode 1) QTM-8000 Series RS-232 QTM-8524 QTM-8524 Configuration: QTM-8524 RS-485 QTM-8524 Configuration: Interface: RS-232 Interface: RS-485 Full Duplex Full Duplex Synchronous Synchronous Master Slave Baudrate: 19200 bps MAX Baudrate: 19200 bps MAX Channel: 1 Channel: 1 Figure 5.2--QTM-8524 as part of a QTM-8000 Series Data Acquisition and Signal Conditioning Network Figure 5.
5.3 Multiple PC Communication (Mode 2) RS-232 RS-232 QTM-8524 QTM-8524 Configuration: (All Modules) Interface: RS-232 QTM-8524 RS-232 QTM-8524 Half Duplex Synchronous Slave Baudrate: 57600 bps MAX Figure 5.3--QTM-8524 modules used to network multiple PCs Figure 5.3 above depicts a basic multi-point application. In this type of application, multiple QTM-8524 modules can operate in a single wireless network. All modules must be configured to Half-Duplex communication and must be set in Slave State.
5.4 Asynchronous Communication (Mode 3) RS-232 RS-232 QTM-8524 QTM-8524 QTM-8524 Configuration: PLC QTM-8524 Configuration: Interface: RS-232 Interface: RS-232 Full Duplex Full Duplex Asynchronous Asynchronous Master Slave Baudrate: up to 14.4 kbps Baudrate: up to 14.4 kbps Figure 5.4--QTM-8524 modules in an asynchronous network Figure 5.4 above depicts a basic asynchronous communication application.
6. Approvals FCC Approvals The QTM-8524 is approved pursuant to FCC Part 15.247 for intentional spread spectrum radiators (47CFR15.247) while being used with the Quatech supplied antennas (QTM-24ANT-SW and the QTM-24ANT-C). This certification is applicable in the United States and all of its territories (Guam, Samoa America, US Virgin Islands and Puerto Rico). FCC ID: F4AQTM85242000 The QTM-8524 is approved pursuant to FCC Part 15 Subpart B limits for unintentional radiators.
DOC Approvals (Canada) The QTM-8524 is approved for use in accordance with RSS-210 and RSS139. To prevent radio interference to the licensed service, this device is intended to be operated indoors and away from windows to provide maximum shielding. Equipment (or its transmit antenna) that is installed outdoors is subject to licensing. CANXXXXXXXXXXX Additional Antennas This device has been designed for use with an antenna having a maximum gain of 7.5dB.
QTM-24ANT-SW Hole Template Cut this template out of the manual and use it as a guide for drilling the holes needed to install your QTM-24ANT-SW wallmount antenna.
