Linx-technologies TRM-915-DTS Manual de usuario descargar pdf (Pagina 11)

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Writing to Registers

Writing to a volatile register is nearly instantaneous. Writing to a non-volatile

the need for encoding, there are two possible packet structures. The ﬁrst

structure writes a value that is less than 128 (ox80) and the second writes

a value that is higher. The higher value must be split into two values. The

following tables show the byte sequences for writing a register in each

case. Figure 14 shows the command to write to a register.

Reading from Registers

A register read command is constructed by placing an escape character

(0xFE) before the register number. The module responds to this command

by sending an ACK (0x06) followed by the register number and register

value. The register value is sent unmodiﬁed. For example, 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 15.

Read From Conﬁguration Register

Command

Header Size Escape Address

0xFF 0x02 0xFE REG

Response

ACK Address Value

0x06 REG V1

Figure 15: Read from Conﬁguration Register Command and Response

Conguration Registers

Power Mode - Address = 0x4D; NV Address = 0x02

The Power Mode register (regPWRMODE, addr 0x4D) conﬁgures the

operation mode (DTS or LP) and the transmitter output power setting. The

non-volatile register (regNVPWRMODE, addr 0x02) determines the default

setting on power up.

It is important to note that a module conﬁgured to operate in LP mode

does not work with a module transmitting in DTS mode, or vice versa.

However, a module conﬁgured to operate in any of the three DTS modes

does work with any other module transmitting in any of the DTS modes.

LP mode operation must be low power. Additional power settings are

included for cases where the module is used with a lossy antenna, such as

a PCB loop trace. Figure 16 shows examples of the commands.

Figure 16: Power Mode Command and Response

Power Mode Register Values

V1 Mode Power Setting Output Power

0x00 LP Mode Low -4dBm

0x01 DTS Mode Mid-low +1dBm

0x02 DTS Mode Mid-high +6dBm

0x03 DTS Mode High +11dBm

0x04 DTS Mode Low -4dBm

0x05 LP Mode Mid-low +1dBm

0x06 LP Mode Mid-high +6dBm

0x07 LP Mode High +11dBm

Figure 17: Power Mode Register Values

Power Mode

Read Command Read Response

Header Size Escape Address ACK Address Value

0xFF 0x02 0xFE

0x4D

0x02

0x06

0x4D

0x02

Write Command

Header Size Address Value

0xFF 0x02

0x4D

0x02

Warning: Be sure that the module is properly powered and remains

powered for the duration of the register write. Loss of important

conﬁguration information could occur if the unit loses power during a

non-volatile write cycle.

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

Figure 14: Write to Conﬁguration Register Command

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 24 25

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