Hexin Technology HXSP-2108A Optical Isolation RS-232 to RS-485 Converter - Manual (Page 2)

Http://www.hexin-technology.com/
There are two connection methods:
Two HXSP-485 converters connect:
HXSP-485 …………………………………HXSP-485
Data (＋)
…………………………………Data (＋)
Data (－) …………………………………Data (－)
GND …………………………………GND
HXSP-485 connect with RS-485 equipment
HXSP-485………………………………… RS-485 equipment
Data (＋)……………………………………T+/R+ or 485+
Data (－)……………………………………T-/R- or 485-
Problem analysis：
1. Data communication unsuccessful
A. Check RS-232 interfaces whether to be correct;
B. Check RS-485 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)