Define Instruments Twin Link devices provide point-to-point wireless I/O where installing signal cable is difficult or costly. Each sender/receiver pair combines signal transmission and control, while optional repeaters support obstructed or extended paths.
Twin Link I/O Capacity
| Function | Supported capability |
|---|---|
| Analog input | Thermocouple, RTD, mA, or frequency |
| Analog output | Two isolated 4-20 mA outputs |
| Digital input | Four per node |
| Digital output | Two per node |
| Relay output | Two per node |
Use the digital and relay channels for control, alarms, or signal pass-through in transparent mode. Select the analog input type to match the field signal, then use the isolated 4-20 mA outputs to connect the received values to the downstream control system.
Wireless Range and Repeater Limits
The specified transmission distance is up to 0.9 miles with line of sight or 500 ft through walls. These are different path conditions, so evaluate the actual installation against the applicable case rather than treating either distance as guaranteed site coverage.
Add repeaters when the direct signal path is inadequate. The system supports up to 15 repeaters for improving the signal path and extending range; the evidence does not specify the distance added by each repeater.
Configure and Verify with Define ToolBox
Configuration requires Define ToolBox software and the DEFINE-BRIDGE-KEY fob USB adapter interface cable.
- Connect the Twin Link device through the DEFINE-BRIDGE-KEY interface cable.
- Configure the required analog and digital I/O in Define ToolBox.
- Use the simulation feature to check the configured I/O behavior.
- Export the completed configuration and generate PDF documentation for the project record.
Before commissioning, verify that each configured input produces the intended isolated 4-20 mA, digital, or relay output at the receiving node. Where the direct path is insufficient, add repeaters without exceeding the 15-repeater limit and repeat the signal-path verification.
FAQ
How far can Define Instruments Twin Link transmit?
Twin Link supports transmission up to 0.9 miles with line of sight or 500 ft through walls. Actual commissioning should verify the signal path under the installation's specific obstructions and geometry.
How many repeaters can Twin Link wireless I/O use?
Up to 15 repeaters may be installed to improve the signal path and extend range. No fixed distance increase per repeater is specified in the available evidence.
What is required to configure a Twin Link device?
Use Define ToolBox software with the DEFINE-BRIDGE-KEY fob USB adapter interface cable. ToolBox supports analog and digital I/O setup, simulation, configuration export, and PDF documentation.