Hexin Technology HXSP-422A RS-232 To RS-422 Converter User Manual
Page 2
RS-422 Network Bus
Connection schematic diagram
Problem analysis：
1. Data communication unsuccessful
A. Check RS-232 interfaces whether to be correct;
B. Check RS-422 interfaces whether to be correct;
C. Check whether RS-232 signal level（TXD、DTR、RTS） lower than＋5V, if that,
it can get through power from 6
th
pin of DB9 Male.
2. Data missing or messy code
A. Check whether the baud rate and format of both sides of data communication
equipment are same.
B. If possible, add the matched resistance on the terminal circuit (120 Ω,1/4 w)