Hexin Technology HXSP-485C User Manual
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HXSP-485 RS-232/RS-485 Converter
User Guide
Product introduction
HXSP-485 series converter is bi-directional connector converter between
RS-232 and RS-485; it is mainly used for communication between main
controller machines, main controller machine and SCMs or Peripherals,
point to point and point to points remote communicate network, it achieve
request-response communication between multi-machines, it is mainly
used for the field of electricity, industrial automatic control, IC card billing
system; such as one card solution, access control system, parking
system, and so on.
HXSP-485 series converters change the TXD and RXD signals of RS -232
serial port to 2 wire half duplex RS-485 signal. No need to get through the
power, it can get the electricity from the 3rd pin of RS-232 interface , at
the same time, there is a request sending by 7th pin(RTS), 4th pin data
terminal prepares(DTR) to help power supplying HXSP-485. The
automatically process control make you need not reset and make a easy
application of the hardware and software installation.
Specification
1. Standard: Accord EIA RS-232, RS-485 standard.
2. Connector: DB9 female on RS-232 side, DB9 male with 4 or 6 terminal
block on RS-485 side.
3. Work methods: asynchronous, point to point or multi -point, 2 wire
half-duplex.
4. Transmission medium : Ordinary Line , twisted pair cable or Shielded
Wire
5. Baud rate: 300~115000bps.
6. Transmission distance: 5 meters (RS-232 side) and 1200 meters
(RS-485 side).
7. Communication protocol: Transparent.
8. Environment: -10℃ to 85℃ working temperature, 5% to 95% relative
humidity.
9. Signals: RS-232 TXD, RXD,GND ; RS-485 Date+, Date-,GND .
Connection wire and signals ：
RS-232 Side(DB9 Female) RS-485（ DB9 Male ）
1
. . . .
9
1
. . . .
9
RS-232 pin definition
DB9 Fema le
1234567
8
DCD
RXD
TXD
DTR
GND
DSR
RTS
CTS
RS-485 pin definition
DB9 Male
12345
6
Data
Data
GND
+12V
There are two situations about working power supply:
1. It can get the electricity from the 3rd pin of RS -232 connector, at the same
time, there is a request sending by 7th pin (RTS), 4th pin data terminal
prepares (DTR) to help power supplying HXSP -485.
2. When the RS-232 cannot power supply, it can be power su pply by RS-485
6th pin (+5~+12V) and 5thPin (GND).
Installation and Application
1. Installation:
① Prepare two pieces ordinary wire or twisted pair cable before installing
HXSP-485 products;
② Close the serial port of equipment (turn off the equipment);
③ The RS-232 port of HXSP-485 series converter use DCE method, it can
plug into DB9 Male DTE equipment directly (e.g. COM port of
computer) ,and get the electricity from TXD 、DTR、RTS signals but please
notice that the SL (signal level) should be higher than +5V，if the equipment
uses the DCE method, it must be connect as below:
Equipment
DB 9-pin corresponding
RS-232 of HXSP-485
123456789
DB9 male of DCE
132456789
RS-485 Equipment and HXSP-485 connection table:
HXSP-485 RS-485
DB9 Male
HXSP-485 RS-485
Board
RS-485 equipment
Pin1 Data-
Data-
DataPin2 Data+
Data+
Data+
Pin3
GND
Pin4
GND
Pin5 GND
+5~+12V
GND
Pin6
2. Application
1) The communication of RS-232 equipment and RS-485 equipment
This method is mainly used for control -side equipment connector is RS -232c ,
and the connector of equipment under control is RS-485 ,The two side can not
communicate directly because of disaccord of two side electrical specialty ,
HESP-485 series converter can be used for transparent change the RS-232
signals to RS-485 signals.
2) RS-485 Network Application
A RS-232 Host will control more than 32 RS-485 equipment, use this method ,
in order to avoid signal reflex and interfering signal, it should be add the
matched resistance on the terminal circuit ( 120Ω,1/4 w)
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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 6th 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)
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