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RS485 Interface (Modbus RTU)

One-channel RS485 interface extention

๐Ÿ’Ž Possibilitiesโ€‹

  • Integration any RS485 devices up to 32 per block
  • Supported MODBUS RTU
  • Supported any Binary or ASCII RS485 protocols
  • Isolated RS485 interface


โ“ Descriptionโ€‹

RS485 interface block intended for integration third-party RS485 devices in automated control systems in the fields of industry, housing and communal services and household services.

๐Ÿ”ง Technical dataโ€‹

DesignUniversal housing for mounting on a DIN rail (width 2 din)
Degree of protection housingIP20
Supply voltage10โ€ฆ25 VDC (12 or 24 V nominal)
Power consumption, no more2.5 W
Number of RS485 interfaces1
Isolated interfaceYes
Max number of RS485 devices32
USBService connection
RS485**YoctoBUS protocol
Isolated RS485Modbus RTU or Binary or ASCII
Ethernet**IEEE 802.3 10/100BASE-T (http, UDP)
WiFi**IEEE 802.11 (http, UDP)

** Depending on unit configuration.

  • For YoctoBUS blocks: the default exchange protocol type is YoctoBUS, initial configuration is not required.
  • For YoctoLAN units: when connecting to the network via Ethernet, initial configuration is not required, when connected via WiFi, you must set the SSID and Password using the CONNECT Configurator software.

To integrate the unit into third-party systems, the protocol and RS485 exchange rate, as well as network settings, are set through the free, cross-platform CONNECT Configurator software.

๐Ÿ‘โ€๐Ÿ—จ How to connectโ€‹

RS485 controlโ€‹


LAN controlโ€‹


๐Ÿ”Œ API for integration into third-party systemsโ€‹

The block is controlled by next APIs:


It is recommended to configure the RS485 parameters using the CONNECT Configurator software

YoctoBUS mode


YoctoBUS protocol commands are in text form.

  • Writing an ASCII string to external RS485 (RS485 ASCII mode):
  • Writing HEX value to external RS485 (RS485 HEX mode):
  • Reading last ASCII string from external RS485 (RS485 ASCII mode):
  • Reading last HEX value from external RS485 (RS485 HEX mode):
  • Response when an ASCII string is received from external RS485 (RS485 ASCII mode):
  • Response when HEX value is received from external RS485 (RS485 HEX mode):

aaa - bus block address

vvvvv - HEX value / ASCII string