Universal service adapter USA 2.2 is used:
- To connect STRELA sensors with interfaces RS-232, RS-485, TTL UART to a personal computer. The device supports any data protocols, the physical implementation of which is based on RS-232, RS-485, TTL UART interfaces.
- For measurement of frequency, voltage and current consumption of STRELA sensors connected to the adapter using special software.
- To generate a special signal "Calibration" to calibrate STRELA sensors with voltage and frequency output.
- To set Summator light, FLS mediation device, Counter-indicator etc
Main technical characteristics of communication interfaces.
| Name | Value |
| RS232 interface | |
| Input signal voltage range | ±30V |
| Output signal voltage range | ±5V |
| Used data transmission lines | RS-232-Tx, RS-232-Rx, common line |
| RS485 interface | |
| Input signal voltage range | -7...+12V |
| Output signal voltage range | 0.....+5V |
| Length of communication line with external device | no more as 1200m. |
| Quantity of sensors in network | no more as 32 |
| Used data transmission lines | RS-485-B, RS-485-A |
| TTL UART | |
| Input voltage range (Rx UART) | 0...+5V |
| Output voltage range (Tx UART) | 0...+5V |
| Length of communication line with external device | up to 3m. |
| Frequency measurement | |
| Range of measured frequencies | 10...30000Hz |
| Absolute measuring error in the range from 10 to 10000 Hz | ±1Hz |
| Reduced measuring error in the range from 10 to 30000 Hz | 0.5% |
| Threshold voltage | 2.5V |
| Measuring time | 1s |
| Voltage measurement | |
| Range of measured voltages | 0...15V |
| Reduced measuring error | 0.5% |
| Measurement of current consumption | |
| Maximum current | 100mA |
| Reduced measuring error | 1% |
| Characteristics of the power line | |
| Rated output voltage | 12V |
| Maximum current | 100mA |
| Other characteristics | |
| Source of power | USB port |
| Maximum current consumption | 200mA |
| Galvanic isolation | up to 1500V |
| Baud rate | up to 115200 bits per second |