The Model 1250 was designed to meet the original ASOS Optical Design specification while significantly reducing cost through incorporation of modern optical components.
| General Description | ||
| Type | Full-Duplex RS232C | |
| Data Rate | 2.4 Kbps | |
| Data Type | Asynchronous | |
| Transmission Range | 10-1500 feet | |
| Power Interface | +5VDC via signal connector or terminal block | |
| Dimensions | 2.5 x 1.3 x 1.1″ | |
| Optical Signal | ||
| Emitter Type | LED | |
| Emitter Wavelength | 820-850nm | |
| Detector Type | PIN | |
| Optical Budget | 7dB Minimum | |
| Electrical Interface | ||
| Connector Type | 9-Pin “D” male (AMP 745071-1) | |
| Range | 6 feet, typical; 25 ft. max. | |
| Environmental | Max | Min |
| Operating Temperature | 120° F | -60° F |
| Withstanding Temperature | 130° F | -80° F |
| Relative Humidity | 100% | 0% |