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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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TRM-915-R250 Datenblatt(PDF) 20 Page - Linx Technologies |
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TRM-915-R250 Datenblatt(HTML) 20 Page - Linx Technologies |
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20 / 39 page  – – – – 34 35 Configuration Registers The following sections give details on each configuration register. Green addresses in the tables are volatile locations and blue are non-volatile. CRC Error Count - Address = 0x40 The value in the regCRCERRCOUNT register is incremented each time a packet is received that fails CRC check. Writing 0x00 to this register initializes the count. Figure 27 shows the command and response. Channel Hop Table - Address = 0x4B; NV Address = 0x00 The module supports 6 different hop sequences with minimal correlation. The sequence is set by the value in the regHOPTABLE register. Changing the hop sequence changes the physical band utilization, much the same way that a channel does in a static transmitter. Valid values are 0-5. Figure 28 shows the command and response. Figure 29 shows the RF channels used by the 250 Series and the hop sequences referenced by channel number. The default hop sequence is 0. Figure 27: 250 Series CRC Error Count Command and Response Figure 28: 250 Series Channel Hop Table Command and Response 250 Series CRC Error Count Read Command Read Response Header Size Escape Address ACK Address Value 0xFF 0x02 0xFE 0x40 0x06 0x40 V1 Write Command Header Size Address Value 0xFF 0x02 0x40 V1 250 Series Channel Hop Table Read Command Read Response Header Size Escape Address ACK Address Value 0xFF 0x02 0xFE 0x4B 0x00 0x06 0x4B 0x00 V1 Write Command Header Size Address Value 0xFF 0x02 0x4B 0x00 V1 Writing to Registers Writing to a volatile register is nearly instantaneous. Writing to a non-volatile register typically takes 16ms. Because the packet size can vary based on the need for encoding, there are two possible packet structures. The first structure writes a value that is less than 128 (0x80) and the second writes a value that is higher. The higher value must be split into two values. Figure 25 shows the byte sequences for writing a register in each case. The module responds with an ACK (0x06). If it is not received, the command should be resent. The module responds with a NACK (0x15) if a write is attempted to a read-only or invalid register. Reading from Registers A register read command is constructed by placing an escape character (0xFE) before the register number. The module responds by sending an ACK (0x06) followed by the register number and register value. The register value is sent unmodified, so if the register value is 0x83, 0x83 is returned. If the register number is invalid, the module responds with a NACK (0x15). The command and response are shown in Figure 26. Figure 26: 250 Series Read from Configuration Register Command and Response Warning: The module must remain powered for the duration of the register write or important configuration information could be lost. Figure 25: 250 Series Write to Configuration Register Command 250 Series Read From Configuration Register Command Header Size Escape Address 0xFF 0x02 0xFE REG Response ACK Address Value 0x06 REG V1 250 Series Write to Configuration Register Command Command for a Value less than 128 (0x80) Header Size Address Value 0xFF 0x02 REG V1 Command for a Value greater than 128 (0x80) Header Size Address Value 1 Value 2 0xFF 0x03 REG 0xFE V2 |
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