PORTS Forum

Ports and Interfaces => Serial Ports => Topic started by: GlennP on June 22, 2018, 06:44:13 am

Title: Creating a 485/422 Host...
Post by: GlennP on June 22, 2018, 06:44:13 am

Hi,
Long time since I have been here, but I want to make sure I configure correctly for a 485/422 host.  I am guessing the host is defined as the device that transmits the packet of data over the network to each device.

Title: Re: Creating a 485/422 Host...
Post by: Jan Axelson on June 22, 2018, 08:37:25 am

RS-485 and RS-422 are hardware standards only. They don't address protocols.

An RS-422 network has one driver and up to ten receivers.   

An RS-485 network can have multiple drivers and receivers and can use any protocol to decide who gets to transmit. For example, a designated node might send messages that include a node address, and the addressed sends a response. Or the nodes might transmit in a defined sequence.

Title: Re: Creating a 485/422 Host...
Post by: GlennP on June 22, 2018, 09:28:38 am

Ah, I am right the 'host' is the PC/Widget sending the data.