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Cervis MRF450, Руководство пользователя

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Cervis MRF450 Скачать руководство пользователя страница 15

User Manual 

2014 Cervis, Inc. 

 

 

9

The inter-byte timer is set to 10 byte-times.  At 115200 baud this is 868 µs.  The last-byte timer 
is set to 25 byte-times.  At 115200 baud this is 2170 µs. 

7.3 Acknowledgement 

Every packet sent to the module will result in a response packet sent back to the host.  In 
addition, the module will generate a message to the host when an RF packet is received and 
destined for the host.  In UART mode the packet will be sent asynchronously.  The host must 
examine the state of F0 in SPI mode in order to determine if a packet is waiting. 

 

Содержание MRF450

Страница 1: ...2014 Cervis Inc MRF450 User Manual U077 0 2 MRF450...

Страница 2: ...Canada To reduce potential radio interference to other users the antenna type and its gain should be so chosen that the equivalent isotropically radiated power e i r p is not more than that necessary...

Страница 3: ...smit Mode 7 7 0 Communication Protocol 8 7 1 SPI 8 7 2 UART 8 7 3 Acknowledgement 9 8 0 Messages 10 8 1 Get Set Parameter 10 8 2 Transmit 12 8 3 Receive 13 8 4 Error 14 List of Figures Figure 1 MRF450...

Страница 4: ...Module RF450 U077 0 2 MRF450 ii Table 9 Receive Message Structure 13 Table 10 Error Message Structure 14...

Страница 5: ...User Manual 2014 Cervis Inc iii Notes and Observations...

Страница 6: ......

Страница 7: ...st abide by all applicable Federal State and Local laws concerning installation and operation of the equipment Failure to comply could result in penalties and could void user authority to operate the...

Страница 8: ...dio is designed to operate in the 450 470 MHz band with a maximum output power of less than 15 dBm The radio can operate on any center frequency in the band with a resolution of 1 kHz The center frequ...

Страница 9: ...P1 1 VDC 3 3V P1 2 VDC GND P1 2 TMS IN P1 3 Enable IN High P1 3 VDC GND P1 4 OC Flag OUT Low P1 4 TCK IN P1 5 SPI SCK IN P1 5 VDC GND P1 6 SPI SDI UART RX IN P1 6 TDO OUT P1 7 SPI SDO UART TX OUT P1 7...

Страница 10: ...pecial accessories Install the RF adapter cable by plugging the MCX plug into the MCX jack on the module RFE2 Affix the RP TNC end of the adapter cable to the housing of the host device utilizing the...

Страница 11: ...at a logic low level when idle CHPA clock phase is 1 meaning that data is latched on the rising edge of the clock and changed on the following edge The SPI port requires that nSS be asserted at least...

Страница 12: ...the error percentage Results greater than 4 typically do not work 1 5 0 RF Characteristics The OTA structure is formatted as in Table 3 Table 3 OTA Structure Format 0 4 5 6 7 n n 1 n 2 Preamble Sync P...

Страница 13: ...ost and module has restrictions The host may only issue transmit requests when a manual event occurs on the host for example when a button is pressed There is no limit to the number of transmit reques...

Страница 14: ...ifted out to the host during the transaction If F0 is high the transaction will be handled as a read The module will shift the buffered packet to the host Data shifted from the host to the module will...

Страница 15: ...70 s 7 3 Acknowledgement Every packet sent to the module will result in a response packet sent back to the host In addition the module will generate a message to the host when an RF packet is received...

Страница 16: ...ional Set if present The following table describes the available configurable parameters Table 7 Configurable Parameters ID Parameter Bytes Default Description 0x0000 Channel 2 0x0000 Sets the operati...

Страница 17: ...bling stripping on an address field that was not present in the transmitted packet will result in erroneous payloads stripping will be performed on the specified byte locations regardless of location...

Страница 18: ...ply Transmit ID 0x10 Reply 0xA0 0 1 2 n ID Options Payload 0x10 The Options field is binary encoded and defined as in the following table Bit Option Description 0 Message ACK If set send an ACK messag...

Страница 19: ...ructure Receive ID 0x20 Reply 0xB0 0 1 2 ID Options Time 0x20 The options field is binary encoded and defined as Bit Option Description 0 Message ACK If set send an ACK message to this receive request...

Страница 20: ...0 Error Message Structure Error ID 0xFF 0 1 ID Error 0xFF The Error field is an enumerated type with the following definitions Error Name Description 0 No Error No Error 1 No SOP SOP is missing 2 Leng...

Страница 21: ...User Manual 2014 Cervis Inc 15 Visit our Web site at www cervisinc com 2014 Cervis Inc All rights reserved Content is subject to change without notice...

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