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TRM-915-R250 データシート(PDF) 31 Page - Linx Technologies |
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TRM-915-R250 データシート(HTML) 31 Page - Linx Technologies |
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31 / 39 page  – – – – 56 57 Last Good Packet RSSI - Address = 0x7B This register holds the received signal strength in dBm of the last successful received packet. A successful packet reception is one that causes payload data to be output on the UART interface. The value in this register is overwritten each time a new packet is successfully processed. The register value is an 8-bit signed integer representing the RSSI in dBm. It is accurate to ±3dB and has ±2dB linearity. The values take the LNA gain into account. Immediate RSSI - Address = 0x7C This register returns the current receive signal strength indication in dBm. The signal strength is measured as soon as the command is registered and the value is loaded into the regIMMEDRSSI register. The register value is an 8-bit signed integer representing the RSSI in dBm. It is accurate to ±3dB and has ±2dB linearity. The values take the LNA gain into account. Figure 71: 250 Series Transceiver Last Good Packet RSSI Command and Response Figure 72: 250 Series Transceiver Immediate RSSI Command and Response 250 Series Last Good Packet RSSI Read Command Read Response Header Size Escape Address ACK Address Value 0xFF 0x02 0xFE 0x7B 0x06 0x7B V1 250 Series Immediate RSSI Read Command Read Response Header Size Escape Address ACK Address Value 0xFF 0x02 0xFE 0x7C 0x06 0x7C V1 Exception - Address = 0x79 The module has a built-in exception engine that can notify the host processor of an unexpected event. If an exception occurs, the exception code is stored in this register. Reading from this register clears the exception and, if applicable, resets the EX line. If an exception occurs before the previous exception code is read, the previous value is overwritten. Figure 68 shows examples of the commands and Figure 69 shows the available values. Custom ID These registers contain the factory-programmed custom ID. A value is assigned to OEM customer with a custom version of the module. Contact Linx for details. Figure 70 shows the GUID Registers. Figure 68: 250 Series Transceiver Exception Command and Response 250 Series Transceiver Exception Codes V1 Exception Name Description 0x08 EX_BUFOVFL Internal UART buffers overflowed. 0x09 EX_RFOVFL Internal RF packet buffer overflowed. 0x13 EX_WRITEREGFAILED Attempted write to register failed. 0x20 EX_NORFACK Acknowledgement packet not received after maximum number of retries. 0x40 EX_BADCRC Bad CRC detected on incoming packet. 0x42 EX_BADHEADER Bad CRC detected in packet header. 0x43 EX_BADSEQID Sequence ID was incorrect in ACK packet. 0x44 EX_BADFRAMETYPE Unsupported frame type specified. Figure 69: 250 Series Transceiver Exception Codes 250 Series Custom ID Registers Name Non-Volatile Address Description regCUSTID[1] 0x39 MSB of the custom ID regCUSTID[0] 0x3A LSB of the custom ID Figure 70: 250 Series Transceiver Custom ID 250 Series Exception Read Command Read Response Header Size Escape Address ACK Address Value 0xFF 0x02 0xFE 0x79 0x06 0x79 V1 |
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