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14.9. MODBUS RTU communication (RS485)
Communication via MODBUS RTU protocol is available as standard.
Its implementation must meet the following requirements:
■
A maximum of 47 dampers can be read in a single message
■
The master controller must wait a minimum of 3.5 characters (4 ms at 9600 baud) between two messages
■
If there are several slave controllers on the same communication line, the master controller must wait a minimum of 14
characters (16 ms at 9600 baud) between the last controller response and the first question from the next controller
■
Limit of 10 fast calls every 30 seconds
■
Other communications have a response time of about 1s
Parameter
Factory setting
Possible values
Slave address
1
1…254
Length
8
8 only
Speed
9600 baud
150/300/600/1200/2400/4800/9600/19200
2 stop bits
YES
YES (2 bits) / NO (1 bit)
Parity
None
None / even / odd
The maximum communication speed depends on the length and quality of the communication cable.
The list of read/write variables is provided in Chapter XXV VARIABLE EXCHANGE TABLES.
14.10. BACnet MS-TP communication (RS485)
Communication via Bacnet MS-TP protocol is available as standard.
MS-TP BACnet cannot be operational if IP BACnet is enabled. If IP Bacnet and MS-TP BACnet are enabled, MS-TP
BACnet will be automatically disabled - IP BAcnet is prioritised.
Parameter
Factory setting
Possible values
Device name
CorrigoVentilation
MAC
0
Lower appliance ID
2640
Upper appliance ID (x 10000)
0
Speed
9600 baud
9600/19200/3840076800/115200
Max. master address
127
The maximum communication speed depends on the length and quality of the communication cable.
The list of read/write variables is provided in Chapter XXV VARIABLE EXCHANGE TABLES.
Zehnder Eversky
