Rockwell Automation 20-COMM-H RS485 HVAC Adapter FRN 2.xxx - Manual (Page 42)

4-10 Using Modbus RTU
20-COMM-H RS-485 HVAC Adapter User Manual
Publication 20COMM-UM009D-EN-P
Figure 4.1 Configurable Input Point Operations
With the adapter in 16-bit mode, 8 User IN items are available.
16-bit Mode Example: Write a value of “12” to register 4x0004. Read
register 3x0004 to read the 16-bit data value from drive parameter 12.
With the adapter in 32-bit mode, 4 User IN items are available.
32-bit Mode Example: Write a value of “12” to register 4x0004. Read
register 3x0004 and store the returned 16-bit data. Read register 3x0005 and
Table 4.I Configurable Objects Inputs with Adapter in 16-bit Mode
Modbus
Address
Data Direction Description Values
User
Default
3x0004 Register Input User IN1 Depends on parameter selected 0
3x0005 User IN2
3x0006 User IN3
3x0007 User IN4
3x0008 User IN5
3x0009 User IN6
3x0010 User IN7
3x0011 User IN8
4x0004 Register Output Param # for IN1 0 = Not in use
- or -
1 to maximum parameter # 0
4x0005 Param # for IN2
4x0006 Param # for IN3
4x0007 Param # for IN4
4x0008 Param # for IN5
4x0009 Param # for IN6
4x0010 Param # for IN7
4x0011 Param # for IN8
Table 4.J Configurable Objects Inputs with Adapter in 16-bit Mode
Modbus
Address
Data Direction Description Values
User
Default
3x0004
3x0005 Register Input User IN1 Lo
User IN1 Hi Depends on parameter selected 0
3x0006
3x0007 User IN2 Lo
User IN2 Hi
3x0008
3x0009 User IN3 Lo
User IN3 Hi
3x0010
3x0011 User IN4 Lo
User IN4 Hi
4x0004 Register Output Param # for IN1 0 = Not in use
- or -
1 to maximum parameter # 0
4x0005 Param # for IN2
4x0006 Param # for IN3
4x0007 Param # for IN4
Controller Adapter
and
Drive
Param#
for INx
User
INx
Write Single Register (code 06)
or
Write Multiple Register (code 16)
Read Input Registers (code 04) Request
Response Data