Rockwell Automation 20-COMM-H RS485 HVAC Adapter FRN 2.xxx - Manual (Page 26)

3-4 Configuring the Adapter
20-COMM-H RS-485 HVAC Adapter User Manual
Publication 20COMM-UM009D-EN-P
Setting the Network Parity The parity that the adapter uses to verify data integrity varies based on the
type of network and your network configuration. Refer to the following
table.
1. Set the value of Parameter 07 - [Net Parity Cfg] to the type of parity
that is used on the network.
Figure 3.3 Example Network Parity Screen
2. Reset the adapter (see Resetting the Adapter on page 3-8 ). The actual
network parity is then displayed by Parameter 08 - [Net Parity Act].
Setting Stop Bits (Modbus
RTU only) Parameter 30 - [Stop Bits Cfg] enables you to set 1 or 2 stop bits for the
Modbus RTU network protocol. When the adapter rotary switch is set to
“N2” or “P1,” the Stop Bits Cfg value is ignored and does not transfer to
read-only Parameter 09 - [Stop Bits Act] on power-up or reset (N2 and P1 are
fixed at 1 stop bit).
1. Set the value of Parameter 30 - [Stop Bits Cfg].
Figure 3.4 Example Stop Bits Screen
2. Reset the adapter (see Resetting the Adapter on page 3-8 ). The actual
stop bits is then displayed by Parameter 09 - [Stop Bits Act].
Network Possible Types of Parity
Modbus RTU None, Even, or Odd
Metasys N2 None
Siemens Building Technologies P1 FLN None
Value Type of Parity
0 None (default)
1 Odd
2 Even
Port 5 Device
20-COMM-H
Parameter #: 07
Net Parity Cfg
0
None
Value Type of Stop Bit
0 1-bit (default)
1 2-bits
Port 5 Device
20-COMM-H
Parameter #: 30
Stop Bits Cfg
0
1-bit