IntesisBox
®
BACnet/IP Server - Modbus RTU Master
User’s Manual r14 eng
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This information is subject to change without notice
IntesisBox
®
is a registered trademark of Intesis Software SL
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1.
If the Modbus function code to use for read is
03
and the function code to use for write
is
06
(which is very common), then select the function code
3-Read analog registers
in
column Modbus
Code
and select a BACnet Type
Output
or
Value
for the point (i.e. AO,
AV, BO, BV, MO, MV). With this, IntesisBox will use function code 03 for read the point
in every polling cycle, and whenever a new value for the point is received from BACnet,
the new value will be written in the Modbus slave device using function code 06.
2.
If the Modbus function code to use for read is
01
and the function code to use for write
is
05
(which is also very common), then select the function code
1-Read digital outputs
in column Modbus
Code
and select a BACnet Type
Output
or
Value
for the point (i.e. AO,
AV, BO, BV, MO, MV). With this, IntesisBox will use function code 01 for read the point
in every polling cycle, and whenever a new value for the point is received from BACnet,
the new value will be written in the Modbus slave device using function code 05.
3.
If the Modbus function code to use for read and the function code to use for write are
different than 01-05 or 03-06 (sometimes found with specific devices), then you have to
declare two points in IntesisBox to perform the read and the write separately. The way
to configure this is better explained using an example.
Imagine you have a device, in which a given analog point (register address 100 for
example) of type read/write must be read using function code 03, and must be write
using function code 16.
To be able to read and write this Modbus point from BACnet, you must define two
separate points into IntesisBox, one for read and one for write like the following:
Nb
Dev
Modbus Code
Format
Add. Bit Frac
Bac.Name
Bac.Type
Bac.ID
Active
1
1
3-Read analog registers 4 - 16 bits sig C2
100
0
AI - example of Read Modbus point
0 -AI
0
1-Yes
2
1
16-Write multiple analog
registers
4 - 16 bits sig C2
100
0
AO - example of Write Modbus point
1-AO
0
1-Yes
The important configuration parameters to obtain the desired functionality are highlighted in
green colour, the rest of configuration parameters are irrelevant in this example. Note that
both points must have the same Modbus
Address and the same Modbus
Format.
