MDEV-868-PRC datasheet(29/55 Pages) LINX

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ENCSMA - Polite Spectrum Access Enable

Volatile Address = 0x56; Non-Volatile Address = 0x0B

Carrier-Sense Multiple Access (CSMA), also called Listen Before Talk (LBT)

or Polite Spectrum Access (PSA), is a best-effort transmission protocol

that listens to the channel before transmitting a message. See the Polite

Spectrum Access section for details. Figure 43 shows examples of the

commands and Figure 44 shows the available values.

Setting this register to 0x00 disables PSA, causing an immediate

transmission when a data packet is ready. The application must limit the

duty cycle to <0.1%, since this mode does not conform to ETSI PSA.

Setting this register to 0x01 enables LBT without the duty cycle constraints.

For ETSI conformance, the external device is responsible for ensuring that

the transmitter duty cycle is <10%. The module evenly divides transmission

time among un-busy channels.

Setting the register to 0x02 enables PSA and a limitation of 33.3s per

channel per hour to meet ETSI standards. This is achieved for each

channel by limiting the amount of transmit or response time within a 180s

bandspread interval. This register must be 0x02 to meet the module’s

Declaration of Conformity (DoC).

Figure 43: HumPRCTM Series CSMA Enable Command and Response

HumPRCTM Series CSMA Enable Register Settings

Mode

0x00

Disable CSMA

0x01

Enable CSMA with no duty cycle restrictions

0x02

Enable CSMA with duty cycle restrictions for full ETSI compliance

Figure 44: HumPRCTM Series CSMA Enable Register Settings

HumPRCTM Series CSMA Enable

Read Command

Read Response

Header

Size

Escape

Address

ACK

Address

Value

0xFF

0x02

0xFE

0x56

0x0B

0x06

0x56

0x0B

Write Command

Header

Size

Address

Value

0xFF

0x02

0x56

0x0B

IDLE - Idle Mode

Volatile Address = 0x58; Non-Volatile Address = 0x0D

The value in the IDLE register sets the operating mode of the transceiver.

If the module remains properly powered, and is awakened from a low

power mode properly, the volatile registers retain their values. If the volatile

registers become corrupted during low power, a software reset is forced

and the module reboots.

Awake is the normal operating setting. This is the only setting in which the

RF circuitry is able to receive and transmit RF messages.

Sleep disables all circuitry on-board the module. This is the lowest-power

setting available for the module.

Please see the Low Power States section for more details. Figure 45 shows

examples of the commands and Figure 46 shows the available values.

Figure 45: HumPRCTM Series Idle Mode Command and Response

Figure 46: HumPRCTM Series Idle Mode Register Settings

HumPRCTM Series Idle Mode

Read Command

Read Response

Header

Size

Escape

Address

ACK

Address

Value

0xFF

0x02

0xFE

0x58

0x0D

0x06

0x58

0x0D

Write Command

Header

Size

Address

Value

0xFF

0x02

0x58

0x0D

HumPRCTM Series Idle Mode Register Settings

Mode

0x00

Awake

0x01

Sleep when all status lines are inputs and low

0x02

Sleep when all status lines are low

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