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Modbus Organization

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Define Instruments

RIO-MOD-RTU Remote Terminal Unit with Relay I/O

Type:  Remote Terminal Unit
Description:  The RIO-MOD-RTU is a 24VDC powered Modbus Slave device which can be used as a Remote Terminal Unit (RTU) for any Modbus system. It is ideal for direct connection to Modbus Master PLCs or SCADA systems. The unit uses RS485 as the physical connection and is easily set up through DIP switches. It has addressing for up to 32 devices to co-exist on the bus, and is capable of providing 16 isolated relay outputs and 16 digital inputs. 32 indicator LEDs are conveniently placed on the unit, ideal for commissioning and fault finding. Find out more or buy online at
Connectivity:  Modbus
Features:  Modbus RTU Slave; RS485 connection to Modbus Master PLCs or SCADA systems; 24V DC powered; 16 selectable digital inputs; 16 isolated Form C relays; Software selectable relay state; LED indication for all digital I/Os
Specifications:  Modbus type: RTU slave device; Slave addresses: Up to 15 hardware selectable slave addresses, and 1 software selectable slave address; Serial connection: RS422/RS485; Baud rate: 9600/19200/115200 baud (hardware selectable); Parity: None or even (hardware selectable); Data bits: 8; Stop bits: 1; Supported Modbus function codes: 1 - Read single coils, 2 - Read single discrete inputs, 3 - Read holding register, 4 - read input register, 5 - Force single coil, 6 - Write single holding register, 15 - Force multiple coils, 16 - Write multiple holding register; Power supply: 24V DC ±15%; 16 selectable digital inputs; Input type: select NPN (sink) or PNP (source); 1kHz Input sample rate; Input voltage 5?24V; 16 isolated relay outputs: Change over Form C (10A 250V AC or 10A 30V DC), 1kHz scan rate; Software selectable relay state; Relay auto shutoff feature; 35mm DIN rail case; Dimensions (H x W x D): 2.3 x 10.0 x 5.7" (59 x 255 x 144mm), with plugs in; LED indication: On each relay output and digital input channel