Convert Rs-485 port with 15 pin connector to COM1 9 pin connector

bimalp · 11-17-2008, 10:22 PM

Hi I am Bimal,
I am completely new to Device drivers and hardware related topics. I have a T3805 Weighing scale to which there is a 15 pin port but there is no cable to connect so we brought two connectors one the standard RS-485 connector and 9pin COM1 connector to connect to my computer with cable. Now my is pain how I can wire it up, so I don't loose data
RS-485
1st pin STB
2nd to 9 Data Bits signal
10 busy
11 J1
12 J2
13 GND
14 TXD
15 RXD

The communication is asynchronous serial communication. I am sorry I am am new sorry for any inconvenience in advance Thank you once again

**magnethead** · 11-18-2008, 01:07 PM

15 pin almost sounds like a MIDI cable?

**blackbox_ns** · 11-19-2008, 12:29 PM

Try this pinning, if the pinout of your T3805 is correct this should work.

T3805 DB15 Serial Port
1st pin STB
2nd to 9 Data Bits signal
10 busy
11 J1
12 J2
13 GND----------------------DB9 pin 5 (signal ground)
14 TXD----------------------DB9 pin 2 (RXD)
15 RXD----------------------DB9 pin 3 (TXD)

11-17-2008, 10:22 PM	#1 (permalink)
bimalp Registered User Join Date: Nov 2008 Posts: 1 OS: 2003	Convert Rs-485 port with 15 pin connector to COM1 9 pin connector Hi I am Bimal, I am completely new to Device drivers and hardware related topics. I have a T3805 Weighing scale to which there is a 15 pin port but there is no cable to connect so we brought two connectors one the standard RS-485 connector and 9pin COM1 connector to connect to my computer with cable. Now my is pain how I can wire it up, so I don't loose data RS-485 1st pin STB 2nd to 9 Data Bits signal 10 busy 11 J1 12 J2 13 GND 14 TXD 15 RXD The communication is asynchronous serial communication. I am sorry I am am new sorry for any inconvenience in advance Thank you once again

11-18-2008, 01:07 PM	#2 (permalink)
magnethead Registered User Join Date: Mar 2006 Location: Texas, USA Posts: 3,552 OS: Vista ultimate 32bit My System Blog Entries: 3	Re: Convert Rs-485 port with 15 pin connector to COM1 9 pin connector 15 pin almost sounds like a MIDI cable? __________________ For proper support: what are you running? graphics, cpu, m/board, ram, PSU brand wattage PCI-E requires 26 amps at 12 volts. That's a 650W PSU. Power Supply Info and Selection . Info on thermal compounds & application . TEST PSU USING MULTI-METER . Bench Testing Your System

11-19-2008, 12:29 PM	#3 (permalink)
blackbox_ns I helped the forums. Join Date: Nov 2008 Posts: 143 OS: Xp	Re: Convert Rs-485 port with 15 pin connector to COM1 9 pin connector Try this pinning, if the pinout of your T3805 is correct this should work. T3805 DB15 Serial Port 1st pin STB 2nd to 9 Data Bits signal 10 busy 11 J1 12 J2 13 GND----------------------DB9 pin 5 (signal ground) 14 TXD----------------------DB9 pin 2 (RXD) 15 RXD----------------------DB9 pin 3 (TXD) Last edited by blackbox_ns; 11-19-2008 at 12:31 PM.