Black Box IC107AE-R3, IC107C-R3 manual Introduction, Wire full-duplex point-to-point application

CHAPTER 2: Introduction

2. Introduction

The RS-232↔RS-422/485 Converter (Data Only) allows your RS-232 and RS-422/485 equipment to communicate with each other. It operates in full-duplex mode over 4-wire lines.

A four-wire terminal block on the RS-422/485 port makes installation easy. And this interface converter is flexible: it can work in either point-to-point or multipoint applications. You can set the RS-232 interface as either Data Terminal Equipment (DTE) or Data Communications Equipment (DCE) for a wide range of applications. The Converter is available either as a standalone device (product code IC107A-R3 for 115-VAC power or IC107AE-R3 for 230-VAC power) or as a card (product code IC107C-R3) that can be mounted in an RM005 card-cage rack.

Figures 2-1 and 2-2 illustrate typical Converter applications. In Figure 2-1, the Converter is labeled “terminated”; this indicates that the Converter’s termination switch S2 has been set to ON. Also note that although Figure 2-2 shows only two interconnected Converters, up to 64 of them can be daisychained in a multipoint system. Both figures show the signal flow for the Converter in full-duplex operation for both point-to-point and multipoint applications. (Direction of signal flow is indicated by arrows.)

RS-232 <—> RS-422/485
	Interface Converter			R x A
			T x A
RS-232			T x B	R x B	RS-422/485
Device			R x A	T x A	Device
			R x B	T x B
		Terminated

Figure 2-1. 4-wire full-duplex point-to-point application.

Figure 2-2. 4-wire full-duplex multipoint application.

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