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doc: modbus: update description and add TCP sample references

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Update description and add TCP sample references.

Signed-off-by: Johann Fischer <johann.fischer@nordicsemi.no>
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Johann Fischer 2021-03-11 15:41:15 +01:00 • committed by Carles Cufí
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doc/reference/modbus/modbus.rst
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@ -1,14 +1,16 @@
.. _modbus_api: .. _modbus_api:
MODBUS over serial line (RTU) MODBUS
############################# ######
Modbus is an industrial messaging protocol. The protocol is specified Modbus is an industrial messaging protocol. The protocol is specified
for different types of networks or buses. Zephyr RTOS implementation for different types of networks or buses. Zephyr OS implementation
is currently only available for serial line and may be used supports communication over serial line and may be used
with different physical interfaces, like RS485 or RS232. with different physical interfaces, like RS485 or RS232.
TCP support is not implemented directly, but there are helper functions
to realize TCP support according to the application's needs.
Modbus communication via serial line is based on client/server model. Modbus communication is based on client/server model.
Only one client may be present on the bus. Client can communicate with several Only one client may be present on the bus. Client can communicate with several
server devices. Server devices themselves are passive and must not send server devices. Server devices themselves are passive and must not send
requests or unsolicited responses. requests or unsolicited responses.
@ -27,6 +29,11 @@ Samples
the possibility to try out RTU server and RTU client implementation with the possibility to try out RTU server and RTU client implementation with
an evaluation board. an evaluation board.
`modbus-tcp-server-sample` is a simple Modbus TCP server.
`modbus-gateway-sample` is an example how to build a TCP to serial line
gateway with Zephyr OS.
API Reference API Reference
************* *************