Black Box RS-232/422/485, RS422/485 manual Connector Pin Assignments, Signal Name Pin # Mode

CHAPTER 2: Introduction

2.4 Connector Pin Assignments

The IC1020A has one USB Type B connector and two DB9 male connectors. The IC1021A and IC1022A have one USB Type B connector and four DB9 male connectors. The pinouts for the DB9 connectors are described in Tables 2-1 and 2-2.

Table 2-1. RS-422/485 DB9 male connector pin assignments.

Signal	Name			Pin #		Mode
RX+	Receive Data Positive	1		Input
RX-	Receive Data Negative	2		Input
TX-	Transmit Data Negative	3		Output
TX +	Transmit Data Positive	4		Output
GND	Ground		5		—
RTS+	Request To Send Positive	6		Output
RTS-	Request To Send Negative	7		Output
CTS-	Clear To Send Negative	8		Input
CTS+	Clear To Send Positive	9		Input

Table 2-2. RS-232 DB9 male connector pin assignments.

Signal	Name			Pin #		Mode
DCD	Data Carrier Detect	1			Input
RX	Receive Data	2			Input
TX	Transmit Data	3			Output
DTR	Data Terminal Ready	4			Output
GND	Ground	5			—
DSR	Data Set Ready	6			Input
RTS	Request To Send	7			Output
CTS	Clear To Send	8			Input
RI	Ring Indicator		9		Input

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