MDEV-868-PRC datasheet(28/55 Pages) LINX

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MAXTXRETRY - Maximum Transmit Retries

Volatile Address = 0x52; Non-Volatile Address = 0x07

The value in the MAXTXRETRY register sets the number of transmission

retries performed if an acknowledgement is not received. If an

acknowledgement is not received after the last retry, exception EX_

NORFACK is raised. Figure 39 shows examples of the command.

The time between retries depends on the current baud rate. Figure 40

shows the time between retries based on baud rate. The elapsed transmit

and acknowledgment time is (retries+1) × (PacketTransmitTime + Timeout).

Figure 39: HumPRCTM Series Maximum Transmit Retries Command and Response

HumPRCTM Series Acknowledgement Timeout Times

Baud Rate

Timeout Time

9,600

50ms

19,200

50ms

38,400

30ms

57,600

30ms

115,200

30ms

Figure 40: HumPRCTM Series Acknowledgement Timeout Times

HumPRCTM Series Maximum Transmit Retries

Read Command

Read Response

Header

Size

Escape

Address

ACK

Address

Value

0xFF

0x02

0xFE

0x52

0x07

0x06

0x52

0x07

Write Command

Header

Size

Address

Value

0xFF

0x02

0x52

0x07

ENCRC - CRC Enable

Volatile Address = 0x53; Non-Volatile Address = 0x08

The protocol includes a Cyclic Redundancy Check (CRC) on the received

unencrypted packets to make sure that there are no errors. Encrypted

packets use a key-based error detection method. Any packets with errors

are discarded and not output on the UART. This feature can be disabled

if it is desired to perform error checking outside the module. Set the

ENCRC register to 0x01 to enable CRC checking, or 0x00 to disable it. The

default CRC mode setting is enabled. Figure 41 shows examples of the

commands and Figure 42 shows the available values.

Although disabling CRC checking allows receiving packets with errors

in the payload, errors in the header can still prevent packets from being

output by the module.

BCTRIG - UART Byte Count Trigger

Volatile Address = 0x54; Non-Volatile Address = 0x09

This register selects options for transferring packet data in the HumPROTM

Series. These options are controlled automatically by the HumPRCTM

application and do not have any effect on its operation.

HumPRCTM Series CRC Enable Register Settings

Mode

0x00

CRC Disabled

0x01

CRC Enabled

Figure 41: HumPRCTM Series CRC Enable Command and Response

Figure 42: HumPRCTM Series CRC Enable Register Settings

HumPRCTM Series CRC Enable

Read Command

Read Response

Header

Size

Escape

Address

ACK

Address

Value

0xFF

0x02

0xFE

0x53

0x08

0x06

0x53

0x08

Write Command

Header

Size

Address

Value

0xFF

0x02

0x53

0x08

MDEV-868-PRC Datasheet(PDF) 28 Page - Linx Technologies

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