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HW2 Protocol Series Installation Guide
Communications Configuration:
See the Product Diagram section for the location of the DIP switch labeled “CONFIG”. The following parameters are
configurable:
- Parity (Modbus only): None, Odd, None1 (one stop bit), Even
- Baud rate: 9600, 19200, 38400, 57600 (Modbus), 76800 (BACnet)
off
off
on
off
off
on
on
on
None
Odd
None1
Even
9600
19200
38400
57600 (Modbus)
76800 (BACnet)
off
off
on
off
off
on
on
on
Parity
(Modbus Only)
Baud
DIP Switches 5 to 8
are Unused
Example: No Parity, 19200 Baud
1
2
3
4
5
6
7
8
off
off
on
off
off
off
off
off
None
19200 Baud
Unused
Modbus Point Map
Function Codes:
Function Code
Function
03
Read holding (RW) registers
04
Read input (RO) registers
06
Write single register*
16
Write multiple registers
01
Read coils
05
Write single coil
15
Write multiple coils
* Not supported.
All of these values correspond to BACnet objects with the same name. See the BACnet Conformance Statement for their
definitions.
Note that an attempt to write to “read only” holding registers will give an error and the entire write command will not be
executed even if writing to read/write locations were also requested. Exception code 2 is given in this case. “Preserved” means
the values is maintained through power outages.
32-Bit Input Registers (Read Only):
Register
Description
1
Temperature reading in IEEE 32-bit floating point
3
Humidity reading in IEEE 32-bit floating point
9
Model (numeric representation of ASCII characters)
42
Serial number (numeric representation of ASCII characters)
Installation (cont.)
