TDO340
Teracom TDO340: 4-Channel Relay Output Module for Marine & Industrial Automation
The TDO340 is a four-channel relay output module with SPST contacts, designed to work with MODBUS RTU protocol. Each channel operates completely independently, giving users reliable, electrically isolated switching control across all outputs. Thanks to its non-volatile memory, the unit remembers relay states and configuration even if power is temporarily lost. A built-in watchdog circuit boosts safety further, forcing the relays into a pre-set condition if communication unexpectedly drops. Because it uses RS-485, the unit can sit alongside up to 63 other nodes on the MODBUS line without trouble. It also offers a wide power supply range from 5VDC, LED indicators for status, and firmware update capabilities via the interface. A 120-ohm termination resistor and DIN rail mounting simplify installation.
DIN rail mounting supports easy and clean installation
Integrated 120-ohm termination resistor simplifies network setup
Firmware can be updated through the communication interface
LED shows real-time communication status
