US 11,729,272 B2
Hart-enabled device with reduced communication lines and break extension protocol
Hugo Cheung, Tucson, AZ (US); and Michael Douglas Snedeker, Tucson, AZ (US)
Assigned to TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed by TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed on Sep. 25, 2020, as Appl. No. 17/32,703.
Prior Publication US 2022/0103633 A1, Mar. 31, 2022
Int. Cl. H04L 67/12 (2022.01); H04L 69/08 (2022.01); G05B 19/042 (2006.01); G05B 19/418 (2006.01); H04L 25/02 (2006.01); G06F 13/42 (2006.01)
CPC H04L 67/12 (2013.01) [G05B 19/0425 (2013.01); G05B 19/4186 (2013.01); H04L 25/0264 (2013.01); H04L 69/08 (2013.01); G05B 2219/25428 (2013.01); G06F 13/4213 (2013.01)] 26 Claims
OG exemplary drawing
 
1. A current loop, comprising:
a receiver assembly;
a transmitter assembly;
a first wire coupled to the receiver assembly and the transmitter assembly; and
a second wire coupled to the receiver assembly and the transmitter assembly to complete the current loop, wherein the transmitter assembly includes:
a Highway Addressable Remote Transducer (HART) modem;
a component in communication with the HART modem via a partial set of Universal Asynchronous Receiver-Transmitter (UART) communication lines; and
a break extension protocol controller coupled to or included with the HART modem and configured to support UART and non-UART communications between the HART modem and the component using the partial set of UART communication lines;
wherein the break extension protocol controller is configured to detect a break condition on the partial set of UART communication lines to support UART and non-UART communications between the HART modem and the component; and
wherein the break extension protocol controller is configured to detect the break condition when any one of the partial set of UART communication lines is at a logic low level for longer than a predetermined interval, wherein the predetermined interval corresponds to 11-bits in a UART telegram.