Dwyer MS2-M - Manual (Page 5)

appendix I: Setting Modbus ® Communication Protocol address of Unit
The address assignment is determined by adding the values for each of the
switches that are in the ON position. The transmitter comes from the factory with all
of the dip switches, except position 1, in the ON position as shown in Figure 6
below. The address of the transmitter would be 127 as it would be
64+32+16+8+4+2+1=127. Another example would be if the address desired was
eight, the only dip switch position in the ON position would be position 5 as shown
in Figure 7 below. When power is applied to the transmitter, the LCD (if connected)
will display the current address for approximately 10 seconds. If the current
address is invalid, the LCD will display “A Err”.
appendix II: Modbus ® Registers
Switch Position
address Value 2
64 3
32 4
16 5
8 6
4 7
2 8
1 1
128
ON
1 2 3 4 5 6 7 8
figure 6: address of Transmitter is 127
ON
1 2 3 4 5 6 7
A
8
figure 7: address of Transmitter is 8
Though the minimum possible address would be address 0
when all the dip switch positions were set to OFF, and the
maximum possible address would be address 255 when all of the dip switches were
set to ON, the transmitter only has valid address from 1 to 247. Any address outside
of this range will give an error code.
NOTICe
Register
0001
0002
0003-0004
0005-0006
0007-0008
0009-0010
0011-0012
0013-0014
0015-0016
0017-0018
0019
0020
0021-0022
8001-8006
8007-8012
8013-8018
8019-8024
Description
Pressure in
0.001 inches
of water
column
Pressure in
Pascal
Pressure in
inches of
water column
Pressure in
Pascal
Pressure in
mm of water
column
Pressure in
kilopascals
Velocity in feet
per minute
Velocity in
meters per
seconds
Flow in cubic
feet per
minute
Flow in cubic
meters per
second
Sensor Type
Pressure
Sensor
Operational
Pressure
Sensor Errors
Modbus
®
Application
Firmware
Version
Sensor
Application
Firmware
Version
Modbus
®
Application
Serial Number
Sensor
Application
Serial Number
Data
Type
Signed
16Bit integer
Signed
16Bit integer
Float
Float
Float
Float
Float
Float
Float
Float
Unsigned
16Bit integer
Unsigned
16Bit integer
Unsigned
32Bit integer
String
String
String
String
Value
0...3
0...1
0...2 32 -1
Range
0-None,
1-Hall,
2-Piezo,
3-Capcell
Operational-
Nonoperational
0...2 32 -1
Multi-address
Supported
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No