TSS721A: MBUS and TSS721A

GARETH OU

Part Number: TSS721A
Other Parts Discussed in Thread: TSS521

The customer wants to make a circuit from RS232 (422,485) to MBUS Master, can you provide relevant technical information first (there is already a TSS721A spec), is there a reference schematic?

over 3 years ago

0 Eric Hackett over 3 years ago

TI__Guru 74372 points

Gareth,

We don't have an exact reference design for this. I've notified engineers who can help address this question, please allow some time as it is a holiday week in the US.

Regards,

Eric Hackett

0 Danny Bacic over 3 years ago

TI__Mastermind 26836 points

Gareth,

Unfortunately the TSS721A and TSS521 serve as meter-bus slave devices. These are the only MBUS solutions that TI offers.

We do have a reference design (TIDM-FRAM-WATERMETER) that shows this operating as a slave device, but we wouldn't have anything prepared that exhibits bridging between MBUS and RS-232/RS-485.

Best,

Danny

0 GARETH OU over 3 years ago in reply to Danny Bacic

Guru 12105 points

Hi Danny

The customer wants to convert the MBUS from the system via RS232 or 485 via TSS721, is this OK?

Please also provide assistance in providing similar application schematic

Thanks

0 Danny Bacic over 3 years ago in reply to GARETH OU

TI__Mastermind 26836 points

Gareth,

Sorry if there was any confusion from our prior posts, but unfortunately we don't have any application schematic for this type of use case with RS-xxx.

There are some typical application diagrams in the TSS721A data sheet that show how it can interact with a microcontroller. From your drawing, I don't see why an RS-232 or similar transceiver would be needed here. Additionally, you'd need to keep in mind that RS-232 is a full-duplex communication protocol, while the TSS721A operates as a half-duplex device.

Best,

Danny

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TSS721A: MBUS and TSS721A