M100760_RS232_Wiring_Guide8229.pdf

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1、 Guide to Wiring RS232 Serial Connectors and Cabling Memex Automation Inc.777 Walkers Line,Burlington,Ontario Canada L7N 2G1 Phone:905-635-3040 Fax:905-631-9640 Sales:Phone:905-635-3043 Memex Automation Inc.,777 Walkers Line,Burlington,Ontario Canada L7N 2G1 Phone:905-635-3043 Fax:905-631-9640 Inter

2、net:http:/www.memex.ca Page 2 of 3 P:ISO9000DOCs777 MemexM100760 RS232 Wiring Guide.doc RS-232C Standard Serial Pinout RS-232(EIA-232-A)Function DB-25 pin#DB-9 pin#Shield 1 Transmit Data(TD)from DTE to DCE 2 3 Receive Data(RD)from DCE to DTE 3 2 Request to Send(RTS)4 7 Clear to Send(CTS)5 8 DCE Read

3、y(DSR)6 6 Signal Ground(SG)7 5 Received Line Signal Detector(DCD)8 1 DTE Ready(DTR)20 4 Ring Indicator 22 9 Below are pictures of DB-9 Female(or Plug)which is typically needed to connect to our Mx1100,and a DB-25-Male(or Pin)used to connect to a Fanuc CNC machine tool.Note that serial ports on a PC

4、are usually DB-9 Male these days and the DB-25 is a parallel printer port.Also make sure that if you use Frame Ground(Pin 1)that it is only connected on one end(usually the machine tool end)as it prevents a ground loop from occurring.If you get an 86 Alarm on and Fanuc control,it means that you need

5、 to jumper Pins 6,8&20 together on the the DB-25.Fanuc controls have a DB-25 Female(Plug)connector,so a DB-25 Male(Pin)is needed on the serial cable.Note that on a Fanuc control Pin 25 is high voltage(+24VDC)-watch out for this.DTE-Data Terminal Equipment(computers,terminals,PLCs,.)DCE-Data Communic

6、ation Equipment(modems,scanners,.)Memex Automation Inc.,777 Walkers Line,Burlington,Ontario Canada L7N 2G1 Phone:905-635-3043 Fax:905-631-9640 Internet:http:/www.memex.ca Page 3 of 3 P:ISO9000DOCs777 MemexM100760 RS232 Wiring Guide.doc Recommended Maximum RS-232 Cable Lengths If you use low capacita

7、nce(11pF/ft)shielded,3 twisted pair cabling you may be able to exceed these cable lengths by about 50%.When connecting Data Rate(bps)Maximum Length(meters)Maximum Length(feet)2400 120 400 4800 60 200 9600 30 100 19200 15 50 38400 7.5 25 57600 5 16 115200 2.5 8 Common interrupt numbers and port addresses Device Interrupt Port number COM1 IRQ 4 3F8h COM2 IRQ 3 2F8h COM3 IRQ 4 3E8h COM4 IRQ 3 2E8h LPT1 IRQ 7 378h