Black Box IC476A-F-R2 - Manual (Page 8)

7
CHAPTER 2: Introduction
The Async 232
↔
422/485 Converter provides exceptional versatility in a
compact package. Requiring no AC power or batteries for operation, the
Converter supports asynchronous data rates up to 115.2 Kbps over one or
two unconditioned unshielded, solid-copper-core twisted pair.
The Converter passes one control signal in each direction (see explanation
in
Section 4.4
) and can handle up to 31 terminal drops in a multipoint
polling environment. The Converter may be configured for high- or low-
impedance operation, carrier may be set to “constantly on” or “controlled
by RTS,” and the unit can operate with or without echo (half-duplex
mode). RTS/CTS delay may be set for “no delay” or 8 milliseconds.
The Converters can be ordered with either male or female DB25
connectors for RS-232. For RS-485/530 connections, you can order either
terminal block with strain relief or DB25 male or female (depending on the
model). Silicon Avalanche Diodes provide 600 watts per wire of protection
against harmful data-line transient surges.
2. Introduction