SHORT HAUL MODEM (SHM-FSK)

5. Jumper Settings

There are several configuration options that can be selected by jumpers as described below. The jumper pins are internal and are identified by lettering on the circuit board. They are accessed by removing the four retaining screws on the top cover of the enclosure and removing the cover. Be sure that the unit is disconnected from power before removing the cover.

5.1 DCE and DTE Settings

Both the SHM-FSK Master and Remote units are configured at the factory as DCE (Data Communication Equipment) for connection to DTE (Data Terminal Equipment). A PC, PLC, or multiplexor is usually configured as DTE. If either the Master or Remote must be changed from DCE to DTE, move the jumpers on blocks “P1” and “P2,” which are located directly behind the DB25 RS-232 connector on the rear panel.

5.2 Transmitter Output Level

The SHM-FSK allows the selection of either normal or high-power (HP) transmitter output. The high-power output has six times greater peak-to-peak transmitted signal and provides correspondingly greater signal-to-noise ratio. High-power transmitter operation is generally best in applications involving sliding contacts or in very noisy EMI environments. However, caution is advised in some cases since high power carrier signals will result in more crosstalk to adjacent conductors.

The jumper to select normal or high power is located at position TP2. High power is selected when the jumper is positioned center to left (marked “H”); normal output is selected with center to right (marked “N”). When using the HP setting, the receiver gain should be set to low for data-line lengths under 5000 feet. (see Section 5.3). The factory setting is normal (center to right, “N”).

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Black Box RS-485, MD3317, ME840A-M, ME840A-S, MD3318 manual Jumper Settings, DCE and DTE Settings, Transmitter Output Level
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ME840A-M, ME840A-S, MD3318, MD3317, RS-485 specifications

The Black Box IC113C and IC175C are part of a series of versatile RS-485 interface converters designed to facilitate reliable data transmission over long distances. RS-485 is a standard defining the electrical characteristics of drivers and receivers for use in serial communications systems, and these specific Black Box converters exemplify the technology's adaptability and robustness.

The IC113C is an RS-485 to RS-232 converter, providing a seamless transition between these two common serial communication protocols. With a compact design, it boasts an operating temperature range of -40 to 85 degrees Celsius, making it suitable for harsh environmental conditions. Its key feature includes the ability to extend the communication distance up to 4,000 feet, which is ideal for industrial applications where devices may be far apart. Additionally, the IC113C includes built-in surge protection, ensuring that the device can withstand electrical noise and spikes, ultimately increasing the system's reliability.

On the other hand, the Black Box IC175C serves as an RS-485 to USB converter, bridging older serial devices with modern USB interfaces. This converter is critical for users wanting to connect legacy equipment to contemporary computing systems. Featuring a plug-and-play design, the IC175C is easy to install with no external power supply required, as it is powered directly through the USB connection. It also supports data rates up to 115.2 Kbps, ensuring fast and efficient data transfer.

Both models employ differential signaling, which enhances noise immunity and allows for greater transmission distances compared to single-ended communication standards. Furthermore, the converters support multiple nodes on the same bus, accommodating a network of devices without requiring complex wiring schemes.

In summary, the Black Box IC113C and IC175C offer essential features that cater to diverse industrial and commercial applications. With their robust construction, extensive operating ranges, and compatibility with various communication protocols, these converters enhance system interoperability and provide durable solutions for long-distance data communication needs. Whether connecting legacy systems or extending communication capabilities, these devices exemplify reliability and efficiency in modern data transmission technologies.
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