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The Black Box ME800A-R4 extends async RS232 beyond the 50 ft limitation using CATx cables at data rates up to 115.2 kbps and reaches distances of 4000 ft. Choose this 4-Wire Short Haul Modem (SHM-C) Async to transmit data up to 4 miles (6.4 km). Run loopback tests simply by pressing a front-panel button. Open the flip-top lid for quick DTE/DCE selection. Transformer and optical isolation protect your data from electrical interference.
SHM–C Async Modems must be used in pairs. This model is also backwards compatible with the ME800A-R3.
| Technology | |
| Category | Serial Connectivity |
| Transmission Distance | 4 miles (6.4 km) maximum |
| Serial Interface | |
| Category | Serial Extender |
| Serial Ports | 1 RS-232/422/485 |
| Baud Rate | 115,2000 bps at 4000 feet (1219.2 m), 57,600 bps at 1 mile (1.6 km), 9,600 bps at 4 miles (6.4 km) |
| Flow Control | 4-wire full-duplex |
| Power | |
| Power Consumption | 7.5 W maximum |
| Connection | 4-screw terminal block and DC power jack |
| Mechanical | |
| Dimensions | 1.5"H x 5.2"W x 5.2"D (3.8 x 13.2 x 13.2 cm) |
| Download Name | File Size |
| Black Box ME800A-R4 Manual | 1.1MB |
| Image | Model | Product Name | Price | |
 | ME721A-M-R3 | Black Box ME721A-M-R3 Async RS232 Short Haul Modem, DB25 Male | $89.25 |
