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ESC Boston: The Serial Port Lives

5/11/2015 04:55 PM EDT
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TonyTib
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Re: TS-7800
TonyTib   5/12/2015 5:27:00 PM
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IT is OK with it, because I'm the IT guy (it's my own box).  However, I don't leave it on when I'm not using it, and I might add a dual boot option later.

MeasurementBlues
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Re: TS-7800
MeasurementBlues   5/12/2015 5:19:55 PM
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That system has Windows XP installed for maximum compatibility with older stuff.

Is the system connected to a network? Seems as though IT people don't like to see XP on "their" network for security reasons.

David Ashton
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Re: USB to RS-485 cable
David Ashton   5/12/2015 4:58:02 PM
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Martin - You can also get these for plain serial port comms in RS-232 (+/- 12V) and TTL (0/5V) levels.  Very handy.

BTW you have "RS-285" in our subject line instead of "RS-485".

David Ashton
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Re: Serial ports
David Ashton   5/12/2015 4:52:46 PM
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Martin...that's exactly the type I have.  Add to that some 25-9 pin converters and some 25- & 9-pin gender changers and you can look at any serial link you wish.  In fact one of mine was retrofitted with DB25 male and female connectors both sides for convenience.

In a previous job - maintaining airline telecomms - one of these was indispensible, especially for connecting serial printers, which are the main offenders for not sticking to the usual RS232 pinout and functions.  Almost every printer needed a specially made up cable, crossing and/or linking some of the handshaking wires so they worked.  And if no-one told you the cable layout, you had to work it out with one of the above breakout boxes.    I can see why someone came along and invented USB - I'm not sure about signal integrity there, but it sure killed the Breakout Box! :-)

TonyTib
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Re: TS-7800
TonyTib   5/12/2015 3:37:29 PM
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DE-9 might be technically correct, but you're not going to change accepted usage (just like EETimes will continue to enthuse by verbing nouns).  Similarly, I believe that the accepted usage of RJ45 isn't correct either, but it's not going to change.


BTW, many motherboards still come with the "old ports", they're just not included on the back panel.  We're still using DE-9DB9 backplates so we can use the on-board serial port to connect to a PLC, even with the latest motherboards (e.g. Asus H97M). 

I have groovy motherboard (Foxconn H61AP) which features a parallel port (backpanel), 2 serial ports (backpanel, motherboard) 6 PCI slots, and 10 USB ports (4 backpanel, 6 motherboard).  That system has Windows XP installed for maximum compatibility with older stuff.

MeasurementBlues
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Re: TS-7800
MeasurementBlues   5/12/2015 3:08:00 PM
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three RS232 tx/rx pairs on the DB9 connector

Actually, it's a DE9 connector. The "B" refers to the shell size. In reality:

  • DA-15
  • DB-25
  • DC-37
  • DD-50
  • DE-9

The 9-pin came later, thus having the E-size shell.

I once referred to a DB-9 in an article until somone corected me. I little searching revealed this. Who knew?

 

DE-9 pinout

 

ts-mp
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TS-7800
ts-mp   5/12/2015 2:30:36 PM
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Interestingly, the TS-7800 on the first page actually has ten total serial ports in varying flavors.  There are three RS232 tx/rx pairs on the DB9 connector, and several other serial port flavors (RS485, 422, TTL) represented on header pins across the SBC.

MeasurementBlues
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USB to RS-485 cable
MeasurementBlues   5/12/2015 1:12:21 PM
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This came across my desk today.

Electro Industries / GaugeTech (EIG) announces the release of the E205301 direct RS485 to USB communication converter cable designed specifically to work with 2 wire RS485 networks which are native to all EIG meters. The cable is 16 feet in length and has tinned RS485 wiring on one side and a USB port connector on the other side.

 The E205301 is self-powered from the USB port and can be used for many different applications including typical conversion of a string of devices from RS485 to USB and as a programming tool to easily configure any EIG meter using the native RS485 port.

The link to the webpage for the E205301 is: http://www.electroind.com/USB485cable.html. The unit can be purchased direct or through the company's online store.



MeasurementBlues
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Re: Where are you using the serial port?
MeasurementBlues   5/12/2015 10:21:13 AM
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I was kind of surprised to see the serial port on the HP computer. It's not being used. All I/O except for the network is through USB.

Robtwitte
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Re: Where are you using the serial port?
Robtwitte   5/12/2015 10:11:17 AM
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I am surprised you can still purchase a PC with a serial port. Nine pin serial and Win7 ? I may have to buy one!

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