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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
