TDC-GP30 datasheet(39/89 Pages) AMSCO

39 / 89 page

Ultrasonic Flow Converter

Vol. 1

TDC-GP30

5-2

www.acam.de

DB_GP30Y_Vol1_en.docx V0.0



Wrong CRC (cyclic redundancy check)



Collision handling



Unknown commands



Inter-byte gap too large



Wrong start or stop bit

UART Messaging Mode

The UART can be configured to operate in a messaging mode, transferri ng measurement results,

triggered by measure cycle or by firmware decision. Optionally a wakeup byte can be send before a

message is transferred.

UART Baud Rates

The GP30 is able to operate with a low baud rate (4,800 baud) or one of 4 different high baud rates

of up to 115,200.

The baud rate can be changed with the baud rate command by the remote control. Before changing

to a new baud rate, the remote control first has to receive an acknowledge message from the GP30

with the current baud rate.

A low baud rate is typically used for



Initial communication

A high baud rate is typically used for



Programming firmware code & data to GP30



Messaging measurement results in flow meter mode

The baud rate generation in GP30 can be derived from low speed clock LSO (32.768 kHz) or high

speed clock HSO (4 MHz).

For baud rates which are derived from HSO, this clock has to be activated by writing 0b10 to

HSO_MODE in SHR_RC register before starting remote communication with new baud rate. For

messaging mode the baud rate can be separately configured to operate in a high baud rate.

Baud Rate

Command

32.768 kHz

4 MHz

Baud Rate

Low Baud Rate

RC_BRC_LOW

supported

4800

High Baud Rate

RC_BRC_H00

not

supported

19200

RC_BRC_H01

38400

RC_BRC_H10

57600

RC_BRC_H11

115200

TDC-GP30 Datasheet(PDF) 39 Page - ams AG

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