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In addition to the transmitter and receiver circuits, the modem includes RS-232 control-line interfaces, status monitor LEDs, and a loopback switch. A powered device, the SHM-B 2W-A is available in stand- alone 115-VAC (ME755A) or 230-VAC (ME755AE) versions and as a card version (ME755-C) for mounting in our 8- or 16-Card Short-Haul Modem-B Rack. Short-Haul Modem-B (SHM-B) Async • Ideal for most any point-to-point, 4-wire, full-duplex application. • Equipped with a balanced loop interface and optical isolation circuitry, providing protection from differences in ground potential between areas. 724-746-5500 blackbox.com • Local analog loopback circuitry lets you check the operation of both your local and remote units. • Distances up to 4 miles (6.4 km) at 2400 bps over 24 AWG wire. • Speeds up to 19.2 kbps. • Standalone and card versions. The SHM-B Async is an asynchronous, full-duplex, 4-wire line driver/receiver that, when paired with another SHM-B Async, enables two EIA-232 devices to communicate at distances of up to 4 miles (at 2400 bps) over 24 AWG wire and at data speeds of up to 19.2 kbps. In addition to the transmitter and receiver circuits, the SHM-B Async includes EIA-232 control line interfaces, status monitor LEDs, and a loopback switch. The SHM-B Async is available in five versions: • As a standalone 115-VAC model (ME800A). • As a standalone 115-VAC model with cables included (ME800A-R3). • As a standalone 230-VAC model with cables included (ME800AE-CABPAK). • As a rackmount card version (ME805-C). • As a rackmount card version with cables included (ME805C-R3). The SHM-B is designed to operate over a 4-wire metallic circuit, and it works best when used with twisted-pair cable. However, you can use most types of twisted-pair cable, often with little or no performance degradation. It’s also designed for maximum operator safety—there are no voltages greater than 12 VDC or 16 VAC present on the circuit board of the unit. Receive lines are protected from potential ground differences through optical isolators rated at 1500 volts. A typical application using the High-Speed SHM-B Async, a powered driver that’s ideal for sending async data point-to-point at speeds up to 115.2 kbps. High-Speed SHM-B Async (ME802A) Async minicomputer RS-232 cable RS-232 cable Async terminal (2) twisted pairs High-Speed SHM-B Async (ME802A) A typical application in which multiple LD485A-MPs are used for 4-wire, multipoint communications. LD485A-MP (ME836A-R5) Industrial controller LD485A-MPs (ME836A-R5) High-Speed Short-Haul Modem-B (SHM-B) Async • Powered, point-to-point, 4-wire. • Speeds up to 115.2 kbps. • Ideal for applications where data speed is crucial. • Uses two unshielded twisted pairs. • Includes optical isolation to protect against surge damage. • Switch-selectable for DTE or DCE equipment. • Available in both standalone and rackmount card versions. With a pair of High-Speed SHM-B Async units, two RS-232 devices can communicate at speeds of up to 115.2 kbps! Data travels at this rate when the SHMs are configured for 1.5-mile (2.4-km) distances. To get the greatest distance—up to 4 miles (6.4 km) over 24 AWG wiring—set them to operate at 2400-bps speeds. Along with transmitter and receiver circuits, the High- Speed SHM-B Async includes EIA-232 control-line interfaces, status monitor LEDs, and a loopback switch. The High-Speed SHM-B Async is available in both standalone versions (ME802A or ME802A-R3) and a rackmount card version (ME802C). Use these SHMs with 4-wire metallic circuits, with twisted- pair cable offering the best performance. And although you can use most types of twisted-pair cable, to achieve maximum performance, we recommend that you use CAT4 or CAT5 UTP cable. Because there are no voltages greater than ±9 VDC or 17 VAC present on the circuit board of the High-Speed SHM-B Async, it offers maximum operator safety. Receive lines are protected from potential ground differences through optical isolators rated at 2500 volts. Plus, the SHM offers easy installation. Because it‘s switch- selectable for either DTE or DCE equipment, you won’t need any special cross-pinned cables; it works with the modular RJ cable that’s already installed in your building. PLCs RS-232/RS-485 Multipoint Line Driver (LD485A-MP) • Powered, point-to-point or multipoint, 2- or 4-wire. • Provides high-speed service (64 kbps) for large multipoint installations (up to 64 drops). • Works with any DTE that can be polled, regardless of the DTE’s RTS support. • User-selectable port-timeout feature automatically disables a port once it finishes transmission. • Operates in 2-wire half-duplex or 4-wire full-duplex mode. • Maximum distances of 4 miles (6.4 km) at 1200 bps over 24 AWG wire. Here‘s the ideal line driver for multipoint installations where you want to link many terminals—each with its own line driver—to a computer via one master line driver. Use it, for instance, in high-speed and polling applications. Depending on the operatin...

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