Blocks MODBUS RTU - Revision history

Z033 at 03:49, 16 July 2025

2025-07-16T03:49:52Z

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Z033: /* Back to Libraries */

2025-07-16T03:39:42Z

‎Back to Libraries

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Z033 at 06:44, 2 October 2018

2018-10-02T06:44:33Z

Z033 at 06:14, 2 October 2018

2018-10-02T06:14:00Z

Z033 at 06:03, 2 October 2018

2018-10-02T06:03:40Z

Z033 at 12:42, 1 October 2018

2018-10-01T12:42:00Z

Z033 at 12:26, 1 October 2018

2018-10-01T12:26:08Z

Z033: Created page with "== Modbus library == === RTU === ==== MODBUS_RTU_CFG ==== Set bus parameters {| class="wikitable" |- |in |Bus |string | |path to bus device (/dev/ttyS0) |- |in |Baud |int |..."

2018-10-01T11:48:34Z

Created page with "== Modbus library == === RTU === ==== MODBUS_RTU_CFG ==== Set bus parameters {| class="wikitable" |- |in |Bus |string | |path to bus device (/dev/ttyS0) |- |in |Baud |int |..."

New page

== Modbus library ==

=== RTU ===

==== MODBUS_RTU_CFG ====
Set bus parameters
{| class="wikitable"
|-
|in
|Bus
|string
|
|path to bus device (/dev/ttyS0)
|-
|in
|Baud
|int
|
|standard baudrates from 150 to 115200
|-
|in
|Parity
|string[1]
|
|"N" = none, "E" = even, "O" = odd
|-
|in
|Databit
|USINT
|
|Databits (5,6,7,8)
|-
|in
|Stopbit
|USINT
|
|Stopbits (1,2)
|-
|out
|ERR
|bool
|
|indicates some error occurs (0 = OK)
|-
|out
|ERR_ID
|WORD
|
|identifies occured error by unique code
|}

==== MODBUS_RTU_R_COIL ====
Reads one coil register
{| class="wikitable"
| colspan="5" |[[#Asynchronous operations|Asynchronous interface]]
|-
|in
|Bus
|string
|
|path to bus device (/dev/ttyS0)
|-
|in
|UnitID
|byte
|
|device bus address (0-247)
|-
|in
|OfsAdr
|word
|
|register address (1-9999)
|-
|in
|Timeout
|byte
|
|timeout in seconds
|-
|out
|Q
|bool
|
|readed value
|}

==== MODBUS_RTU_R_DISCRETE ====
Read one discrete discrete input register
{| class="wikitable"
| colspan="5" |[[#Asynchronous operations|Asynchronous interface]]
|-
|in
|Bus
|string
|
|path to bus device (/dev/ttyS0)
|-
|in
|UnitID
|byte
|
|device bus address (0-247)
|-
|in
|OfsAdr
|word
|
|register address (1-9999)
|-
|in
|Timeout
|byte
|
|timeout in seconds
|-
|out
|Q
|bool
|
|readed value
|}

==== MODBUS_RTU_R_HOLDING ====
Reads one holding register
{| class="wikitable"
| colspan="5" |[[#Asynchronous operations|Asynchronous interface]]
|-
|in
|Bus
|string
|
|path to bus device (/dev/ttyS0)
|-
|in
|UnitID
|byte
|
|device bus address (0-247)
|-
|in
|OfsAdr
|word
|
|register address (1-9999)
|-
|in
|Timeout
|byte
|
|timeout in seconds
|-
|out
|Q
|word
|
|readed value
|}

==== MODBUS_RTU_R_INPUT ====
Reads one input register
{| class="wikitable"
| colspan="5" |[[#Asynchronous operations|Asynchronous interface]]
|-
|in
|Bus
|string
|
|path to bus device (/dev/ttyS0)
|-
|in
|UnitID
|byte
|
|device bus address (0-247)
|-
|in
|OfsAdr
|word
|
|register address (1-9999)
|-
|in
|Timeout
|byte
|
|timeout in seconds
|-
|out
|Q
|word
|
|readed value
|}

==== MODBUS_RTU_W_COIL ====
Writes value to one coil register
{| class="wikitable"
| colspan="5" |[[#Asynchronous operations|Asynchronous interface]]
|-
|in
|Bus
|string
|
|path to bus device (/dev/ttyS0)
|-
|in
|UnitID
|byte
|
|device bus address (0-247)
|-
|in
|OfsAdr
|word
|
|register address (1-9999)
|-
|in
|Timeout
|byte
|
|timeout in seconds
|-
|in
|VAL
|bool
|
|value to write
|}

==== MODBUS_RTU_W_HOLDING ====
Writes value to one holding register
{| class="wikitable"
| colspan="5" |[[#Asynchronous operations|Asynchronous interface]]
|-
|in
|Bus
|string
|
|path to bus device (/dev/ttyS0)
|-
|in
|UnitID
|byte
|
|device bus address (0-247)
|-
|in
|OfsAdr
|word
|
|register address (1-9999)
|-
|in
|Timeout
|byte
|
|timeout in seconds
|-
|in
|VAL
|word
|
|value to write
|}

← Older revision		Revision as of 06:14, 2 October 2018
Line 1:		Line 1:
−	== ~~Modbus~~ Libraries ==	+	== [[Libraries for IEC 61131-3\|Back to Libraries]] ==

	==== MODBUS_RTU_CFG ====		==== MODBUS_RTU_CFG ====

@@ Line 49: / Line 49: @@
 '''Note:'''<br>
 /dev/ttyS3 = BUS1 on the Connector E<br>
-/dev/ttyS2 = BUS2 on the Connector E
+/dev/ttyS2 = BUS2 on the Connector E<br>
 ==== MODBUS_RTU_R_COIL ====

@@ Line 232: / Line 232: @@
 |value to write
 |}
 ==== MODBUS_RTU_W_HOLDING ====

@@ Line 56: / Line 56: @@
 Reads one coil register
 {| class="wikitable"
-| colspan="5" |[[#Asynchronous operations|Asynchronous interface]]
+| colspan="5" | [[Libraries for IEC 61131-3|Asynchronous interface]]
 |-
 |in
@@ Line 92: / Line 92: @@
 Read one discrete discrete input register
 {| class="wikitable"
-| colspan="5" |[[#Asynchronous operations|Asynchronous interface]]
+| colspan="5" | [[Libraries for IEC 61131-3|Asynchronous interface]]
 |-
 |in
@@ Line 128: / Line 128: @@
 Reads one holding register
 {| class="wikitable"
-| colspan="5" |[[#Asynchronous operations|Asynchronous interface]]
+| colspan="5" |[[Libraries for IEC 61131-3|Asynchronous interface]]
 |-
 |in
@@ Line 164: / Line 164: @@
 Reads one input register
 {| class="wikitable"
-| colspan="5" |[[#Asynchronous operations|Asynchronous interface]]
+| colspan="5" |[[Libraries for IEC 61131-3|Asynchronous interface]]
 |-
 |in
@@ Line 200: / Line 200: @@
 Writes value to one coil register
 {| class="wikitable"
-| colspan="5" |[[#Asynchronous operations|Asynchronous interface]]
+| colspan="5" |[[Libraries for IEC 61131-3|Asynchronous interface]]
 |-
 |in
@@ Line 236: / Line 236: @@
 Writes value to one holding register
 {| class="wikitable"
-| colspan="5" |[[#Asynchronous operations|Asynchronous interface]]
+| colspan="5" |[[Libraries for IEC 61131-3|Asynchronous interface]]
 |-
 |in

@@ Line 1: / Line 1: @@
-== Modbus library ==
+== Modbus Libraries ==
 ==== MODBUS_RTU_CFG ====
@@ Line 49: / Line 47: @@
 |identifies occured error by unique code
 |}
 ==== MODBUS_RTU_R_COIL ====