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LAN-RING - Overview of Supported RS485 Modes
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The following rules apply when transmitting data of alarm systems according to ČSN EN 50131-1:
v
All frames are marked with VLAN headers according to IEEE 802.1Q
v
A
ll connected systems have a limited bandwidth (protection against DDoS attacks)
v
Alarm system data has the QoS bits set to the highest priority
We recommend monitoring the activity of all ports of the system using the SNMP protocol
Industrial LAN-RING and PLC IPLOG switches are equipped with a number
of serial interfaces. The switches are mainly RS485 buses, which can
operate in various operating modes.
B
U
S
1
ASSET
GALAXY
MODBUS
RS485
NOTE
ASSET
I&HAS Fides
GALAXY
O
O
P
P
I&HAS Honeywell
MODBUS
P
P
P
P
MODBUS ASCII/RTU
RS485
P
P
P
P
Typically 4-5ms delay between RS ports
Event Management - Serial Bus
BUS
Setting the operating mode of RS485 buses.
Mode
- supported protocol
RS485
-
general RS485 communication with Modbus RTU support
Asset
- for I&HAS systems Asset
Galaxy
– for Galaxy Dimension I&HAS systems
Other items only apply in RS485 mode (Modbus RTU)
Speed
- communication speed 1.2 to 57.6 kbps
Manual bus speed
- manual speed setting up to max 115.2 kbps
Data bits
- number of data bits (5-9) in Byte
Parity
- parity mode (Even, Odd, Space Mark)
Stop bits
- number of stop bits
Check Timeout
- interruption of communication in the Tx or Rx direction
can be signaled by sending an SNMP trap. Trap sending is enabled in the
"SNMP / BUS" menu separately for Rx / Tx direction and bus
Application notes:
RS485 transmission
GALAXY system connection
B U S 2