User's Manual

- 11 -
Introduction
DO Example Circuit
External Device GND
DO x
IOT-800N
DIO
DO GND
DO x = 1 - Open collector
DO x = 0 - Short to Ext. GND
1.7.4 RS-232
Description: RS-232 Connector
Connector type: 1x 4-pin connector
Pin Description
14
1 PWR, 5V
2 RX
3 TX
4 GND