Network Points Ram Variables - Pressura RPM10 Operation And Service Manual

Network Points
RAM Variables
RAM variables use the Modbus command 04 Read Input Registers. RAM variables are read only
variables that correspond to what is shown on Digital Interface Module (DIM) display. TSI offers a
number of different models, so if a feature is not available on a unit, the variable is set to 0.
Variable
Variable Name Address
Room 1 Pressure 0
Supply Flow 1
ACH 2
RH 3
(RPM20 only)
Temperature 4
(RPM20 only)
Exhaust Flow 6
Room 1 Door 7
Status
Anteroom 8
Pressure
(RPM20 only)
Room 2 Pressure 10
(RPM20 only)
Room 2 Door 12
Status
(RPM20 only)
Room 1 13
Occupancy
Room 2 15
Occupancy
(RPM20 only)
EXAMPLE of 04 Read Input Registers function format
This example reads variable addresses 0 (Pressure).
QUERY
Field Name
Slave Address
Function
Starting Address Hi
Starting Address Lo
No. of Points Hi
No. of Points Lo
Error Check (CRC)
74
Information Provided to Master
System
Room 1 Pressure
Supply Flow Rate
Air Changes per Hour
Relative Humidity
Temperature for Room 1
Exhaust Flow Rate
Room 1 Door Status
Anteroom Pressure
Room 2 Pressure
Room 2 Door Status
Room 1 Occupancy
Room 2 Occupancy
RESPONSE
Example # 2 Field Name
(Hex)
01 Slave Address
04 Function
00 Byte Count
00 Data Hi Addr0
00 Data Lo Addr0
01
--
Integer DDC system receives
Displayed in inches H O.
2
Host DDC system must
divide value by 100,000 to
report pressure correctly
Displayed in CFM.
Displayed in number per hour.
Host DDC system must
divide value by 10 to report
ACH correctly.
Displayed in %RH
Displayed in °F
Host DDC system must
divide value by 10 to report
temperature correctly
Displayed in CFM.
1 Door Closed (Normal)
2 Door Open
Displayed in inches H O.
2
Host DDC system must
divide value by 100,000 to
report pressure correctly
2
Displayed in inches H O
Host DDC system must
divide value by 100,000 to
report pressure correctly
1 Door Closed (Normal)
2 Door Open
1 Occupied (Normal)
2 Unoccupied
1 Occupied (Normal)
2 Unoccupied
Example # 1
(Hex)
01
04
02
00
64 (0.00100 "H
O)
2
Appendix B