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GFK-2423G
RTU Function Codes Supported
The Serial Communications module supports the following RTU Function Codes.
Function
Code Value
Function Name
Dec.
Hex.
1
01
Read Output Table
2
02
Read Input Table
3
03
Read Registers
4
04
Read Analog Inputs
5
05
Force Single Output
6
06
Preset Single Register
7
07
Read Exception Status
8
08
Loopback/Maintenance
15
0F
Force Multiple Outputs
16
10
Preset Multiple Registers
17
11
Report Device Type
67
43
Read Scratch Pad Memory
Product Revision History
Revision
Date
IC200CMM020-GA Nov 2019
IC200CMM020-FA
Oct 2016
IC200CMM020-EA
Feb 2012
IC200CMM020-DA Mar 2011
IC200CMM020-CA Mar 2010
IC200CMM020-BA Oct 2008
IC200CMM020-AA Jan 2006
Operational Notes and Open Issues
•
Application programs should use the "Command Ready" indication to synchronize the first command to the
module upon Genius NIU system power up.
•
Do not set the serial port baud rate higher than 19200 baud.
•
The Data Length parameter is ignored for function codes 5 and 6. The Data Start and Data Length parameters are
ignored for function codes 7 and 17. For function code 67, the Data Start parameter must be set to 1 and the Data
Length parameter must be set to 62.
•
Firmware update occurs at 19200 baud. If the module is configured for operation at a different baud rate and you
wish to perform a firmware update, first change the Genius NIU's serial port configuration and select 19200 baud.
Then, when running the Winloader update utility, select 19200 baud. Then return the GNIU's baud rate setting to
its original value.
•
If the Genius bus scan rate is slower than the PLC CPU's sweep time, a command may be written into %AQ memory
at the PLC CPU, but overwritten with a newer command before the original command is transferred to the GNIU for
processing. It will appear that the original command has been "dropped".
RTU Master Command
Send RTU Read/Force/Preset Query
Send RTU Read/Force/Preset Query
Send RTU Read/Force/Preset Query
Send RTU Read/Force/Preset Query
Send RTU Read/Force/Preset Query
Send RTU Read/Force/Preset Query
Send RTU Read/Force/Preset Query
Send RTU Diagnostic Query
Send RTU Read/Force/Preset Query
Send RTU Read/Force/Preset Query
Send RTU Read/Force/Preset Query
Send RTU Read/Force/Preset Query
Following Emerson's acquisition of this product, changes have been made to apply appropriate
branding and registration of the product with required certification agencies. No changes to
material, process, form, fit or functionality.
EU RoHS compliant module per directive 2011/65/EU dated 8-June-2011. No changes to
features, performance or compatibility.
Label change. No changes to features, performance or compatibility.
Labeling change. No changes to compatibility, functions or performance.
Changed manufacturing location. No changes to compatibility, functionality or performance.
Updated Power Supply OK signal circuitry.
Initial product release
Slave
Reference
Type
%Q
%I
%R
%AI
%Q
%R
%Q
N/A
%Q
%R
N\A
N\A
Description
Nov 2019
Valid as
Broadcast
Query?
No
No
No
No
Yes
Yes
No
No
Yes
Yes
No
No
13
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