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Table of Contents
Summary of Contents for DECODE PRM4
- Page 1 DECODE Radio modem PRM4 868MHz User's manual v1.6 http://www.decode.rs...
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Page 2: Table Of Contents
4.1 Setup of the serial interface parameters............14 4.2 Setup of the radio interface................15 4.3 Command mode setup..................16 4.4 Reduced power consumption mode setup............16 5 Firmware update.....................18 5.1 The procedure for writing the new firmware..........18 6 Technical specifications..................19 Radio modem PRM4 868MHz /User's manual V1.6 / 24.05.2011... - Page 3 Document history Date 29.04.2009 Initial version of the documentv1.0 Date 23.06.2009 Revision v1.1 Date 09.12.2009 Revision v1.4 Added AT commands EC and ET. Corrected the AM command format. Date 08.02.2010 Revision v1.5 Bug related to incomplete flushing of transmit buffer when sending data by full-buffer criteria, corrected. Corrected bug related to saving of parameters which haven't been saved with ATWR command while exiting command mode.
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Page 4: Introduction
1 Introduction Decode PRM4 modem is used for data transmission in UHF ISM 868MHz band. Through the use of radio interface it procures networking of devices and systems. Easy to use, the PRM 4 provides secure method of connecting computers, PLC devices, measuring devices and SCADA systems. -
Page 5: Modes Of Operation
2 Modes of operation Decode PRM4 device can operate in one of the two modes of operation. When powered, the device will automatically enter the default, data transfer mode. When the device is in the data transfer mode, it will listen and receive all the packets intended for it, whereas the transmitter will turn-on only occasionally to send the data acquired from the wire connection. - Page 6 The transmit data buffer size is 512 bytes. The following figure shows the example of three-character packet generation and sending on 9600bps with default packetization timeout. Radio modem PRM4 868MHz /User's manual V1.6 / 24.05.2011...
- Page 7 Important note: When calculating the power budget for the reduced power consumption mode, the RS232 signal lines should not be omitted. It is recommended that, in these cases, the transmit/receive signals of the RS232 interface should be switched off when not actively communicating. Radio modem PRM4 868MHz /User's manual V1.6 / 24.05.2011...
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Page 8: Installing The Device
RS-232C, the signal layout matches the DCE side. The following table shows the DB9F connector signal layout for different serial connections. Pin DB9F RS-232 RS-422 RS-485 connector signals signals signals output output -TX/RX input input output input output +TX/RX output Radio modem PRM4 868MHz /User's manual V1.6 / 24.05.2011... - Page 9 (2) On some devices with RS485/422 connection, the signals have been denoted as A and B. In that case, the A signals should be connected to the + signals of the modem. Vice verse, the B signals should be connected to the – signals of the modem. Radio modem PRM4 868MHz /User's manual V1.6 / 24.05.2011...
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Page 10: The Antenna Connector
3 this indicator flashes with the frequency of 8Hz. LED Mode On when the device is in special modes. LED Rx Data Green On when receiving data. LED Tx Data On when sending data. Radio modem PRM4 868MHz /User's manual V1.6 / 24.05.2011... -
Page 11: Jumpers
3.5 Jumpers The jumpers are located on the printed circuit board of the PRM4 device. By altering the state of the jumpers, the serial interface on DB9 port can be set. Serial interface State Jumpers RS-232C J3, J4, J5, J6, J10... -
Page 12: At Command Set
Below the manufacturer name and type of the device, the frequency range and firmware release date are listed. The device output, as a result of ATDC command, is given in the following frame: Radio modem PRM4 868MHz /User's manual V1.6 / 24.05.2011... - Page 13 PACKETIZATION TIMEOUT: 5 RF FREQUENCY: 4000 RF POWER: SOURCE ADDRESS: 0 (0x0) DESTINATION ADDRESS: 0 (0x0) NETWORK ADDRESS: 0 (0x0) ADDRESS MASK: 255 (0xFF) ECHO MODE: SLEEP MODE: ESCAPE CHARACTER: ESCAPE TIMEOUT: 1000 Radio modem PRM4 868MHz /User's manual V1.6 / 24.05.2011...
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Page 14: Setup Of The Serial Interface Parameters
ASCII "+" character. Escape Timeout 10-3000 1000 Defines the required pause time (ms) inserted before and after the "+++" sequence, while "+++" sequence should be entered during the same interval (ms) . Radio modem PRM4 868MHz /User's manual V1.6 / 24.05.2011... -
Page 15: Setup Of The Radio Interface
The modem can only communicate with another modems from the same network. Address Mask 0 – 255 Address mask determines the significant bits used to determine the destination of the packet. Radio modem PRM4 868MHz /User's manual V1.6 / 24.05.2011... -
Page 16: Command Mode Setup
ATSM2 whereas the device operating in normal mode is set with ATSM1. On the other hand, if all the devices are operating in low power consumption mode, they ought to be set with ATSM3. Radio modem PRM4 868MHz /User's manual V1.6 / 24.05.2011... - Page 17 Parameter is expressed in -dBm. Example: 115 value determines that all signals above -115dBm should turn the receiver on, to be received at the same time. Signals weaker than -115dBm will be rejected. Radio modem PRM4 868MHz /User's manual V1.6 / 24.05.2011...
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Page 18: Firmware Update
The following is needed to load the new version of the firmware into the PRM4 device: MSPFET software – Can be located on the CD that is included in the PRM4 product pack. Otherwise, the latest software version can be downloaded from http://kurt.on.ufanet.ru/files/MspFet_16007_devel.zip... -
Page 19: Technical Specifications
-20°C to +75°C, 0 to 95% RH (non condensing) Temperature range Protection IP50 Dimensions 86 x 57 x 26 mm Weight 110g Mounting desktop or optional mounting for 35mm DIN rail Radio modem PRM4 868MHz /User's manual V1.6 / 24.05.2011... - Page 20 Contact Decode Data Communications Address 12G Zorana Djindjica Blvd, 11070 Belgrade, Serbia http://www.decode.rs Email office@decode.rs Tel/Fax +381 11 3110027...
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