Chapter 4: Address and IRQ Setting

Address Switch Setup

A Windows PC has I/O port addresses and memory addresses. Some devices use both types of addresses. I/O port addresses have a 64K address space. Devices may decode all 16 address bits or only some of the lower bits. Traditionally, serial cards have only decoded 10 bits of the address bus. Recently this has begun to cause address conflicts with full 16 bit decoded devices, most notably between video cards and COM 4. B&B has solved these conflicts by decoding all 16 bits of the ISA address bus. Address settings in our ISA bus serial cards is set by DIP switches (selecting bits 11-4) or jumpers.

CAUTION : Electrostatic Sensitive Device.

Use ESD precautions for safe handling.

B&B Electronics 232CC cards are factory configured for COM1 IRQ4, and COM2 IRQ3 (2-port models). If you plan to install the 232CC as standard COM1 and COM2, you may leave the address and IRQ set to the factory defaults.

The 232CC cards use a 7-position DIP switch to program the binary I/O address of each port on the card. Figure 1 is a drawing of the printed circuit board that shows the locations of the setup switches and jumpers on the 232CC cards.

Documentation Number 232CCxx4502

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B&B Electronics Mfg Co – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104 B&B Electronics Ltd – Westlink Comm. Pk – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445

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B&B Electronics 232CC2B, 232CC1B manual Address and IRQ Setting Address Switch Setup, Use ESD precautions for safe handling
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232CC2A, 232CC1B, 232CC2B, 232CC1A specifications

B&B Electronics is renowned for its reliable and high-quality connectivity solutions, particularly in the realm of serial communication. Among its distinguished offerings are the 232CC2B, 232CC2A, 232CC1B, and 232CC1A devices. Each of these products serves distinct yet essential roles in converting RS-232 serial communication to RS-485 or RS-422 standards, making them invaluable in various industrial and commercial applications.

The 232CC2B and 232CC2A are both robust models designed for half-duplex and full-duplex communication, respectively. The 232CC2B offers superior protection with built-in surge suppression, ensuring that the data remains intact even in electrically noisy environments. This model supports up to 1 mile of data transmission, making it ideal for applications in large industrial settings. The 232CC2A, on the other hand, enables full-duplex communication, providing a continuous data stream that increases efficiency and reliability for intensive data applications.

In contrast, the 232CC1B and 232CC1A are more compact, low-cost alternatives tailored for simpler applications that require fewer features. The 232CC1B supports half-duplex communication, suitable for applications where data traffic is moderate. Its small footprint makes it ideal for projects where space is at a premium. Meanwhile, the 232CC1A is designed for full-duplex communication and maintains a reliable data connection while minimizing latency, which is essential for real-time data processing.

All four models utilize advanced isolation techniques to protect users and connected devices from electrical interference and potential damage. These devices are also equipped with LED indicators to provide real-time status updates of data transmission, allowing ease of monitoring and troubleshooting.

In summary, B&B Electronics’ 232CC2B, 232CC2A, 232CC1B, and 232CC1A products represent a comprehensive range of solutions for serial communication conversion. Their varying features and capabilities cater to diverse industrial needs, ensuring reliable communication across a multitude of applications. Whether for complex industrial automation setups or simple data logging tasks, these devices stand as a testament to B&B Electronics’ commitment to quality and performance in the field of connectivity solutions.
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