3 ENABLE COMMUNICATION PROTOCOLS
The Unity card communicates with equipment and 3rd-party systems over the following protocols:
•
BACnet IP
•
BACnet MSTP
•
Modbus TCP
•
Modbus RTU
•
SNMP
•
YDN23
NOTE: No more than two protocols may be enabled on one card. Only one version of BACnet may be
selected: BACnet IP or BACnet MSTP. Only one version of Modbus may be selected: Modbus TCP or
Modbus RTU. Only one of the chosen protocols can use the 485 port. Choosing two 485 protocols will
cause conflicts.
NOTE: Some building-management systems (BMS) can be configured to send continuous updates for
device setpoints, usually setting the same value. The BMS should be configured to send, on a
sustained average, no more than two writes per second to the device. This will allow the device to catch
up after a burst of updates when necessary, while allowing other communication with the device to
proceed.
3.1 Enable Protocols
Protocols may be enabled after a card is installed and configured for basic network connectivity. After a
protocol is enabled, it must be configured, which requires opening the folder for the desired protocol
(
Communications
tab >
Protocols
>
(protocol to configure)
.
To enable two communication protocols:
1. On the Communications tab, select
2. Click
Edit
and enter the administrator user name and password.
3. Click to check the box next to the protocols to use.
•
Only two protocols may be enabled.
•
Only one of the two can use the 485 port.
4. Click
Save
5. Configure the protocols selected. See
Editing the Unity Card Configuration
6. Restart the card:
a. On the Communications tab, click
Support
.
b. Click
Enable
.
c. Click
Restart
.
3.1.1 Enable Modbus Protocol
Protocols may be enabled after a card has been installed and configured.
1. On the Communications tab, select
Protocols
>
Modbus
.
2. Click
Edit
and enter a user name and password.
3 Enable Communication Protocols
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