Troubleshooting, Communication Cable Data

3PXCCXX Serial Card

TD(A-) Pin 3

TD(B+) Pin 2

RD(A-) Pin 1

RD(B+) Pin 9

GND Pin 5

RS-485 Two Wire Device

DATA (-)

DATA(+)

GND

Troubleshooting

If you are unable to communicate with the card from your software:

1.	Consult your software manual to make sure it supports the
	address and interrupt that you have configured.
2.	Double check that the address and interrupt are properly set.
3.	Try another software package for troubleshooting. Download
	SimpTerm (DOS Terminal Emulator) or Comtest (Windows

Figure 6. RS-485 (Two-Wire) Pinout Description

Communication Cable Data

The 3PXCC Serial Card communicates using RS-232, RS-422, and RS-485 communications. The communication cable specifications are 24AWG (wire gauge) and 30pF/ft. (capacitance rating). Twisted pairs are ideal for the RS-422/RS-485 Cable in order to suppress noise on the data line. B&B Electronics can provide this communication cable for RS-232 or RS-422/RS-485 Applications. The Model ETC8195 is a cable style that can be used for RS-232 Applications, and Model ETC8506 can be used for RS- 422/RS-485 Applications.

Documentation No.3PXCC1x-2x-3903

Terminal Emulator) from B&B Electronics’ web site. SimpTerm

and Comtest are shareware Simple Terminal Emulators that can

be used to vary the setup of any serial card. Both can be

downloaded from the following site location.

http://www.bb-elec.com/support.asp

4. Troubleshooting with a Loopback Test

Load Simpterm or Comtest on the test PC. When loading Simpterm you must set up the port address and IRQ you have set on the B&B Electronics serial card.

Jumper TD to RD on the DB9 male connector located on the serial card. You may have to make a “loopback connector” in order to do this. This is done by jumping pin 2 and pin 3 of a DB9 female connector and plugging it into the DB9 male port on the serial card.

To test the RS-232 handshake lines you can also jumper RTS to CTS and DTR to DSR. When you raise the RTS line you should see CTS also go high. When you raise the DTR line you should see DSR also go high.

Send data from the Serial Port (B&B Electronics serial card) and see if the data is echoed back to the port. When a character is typed on the keyboard you must see a duplicate character after the first character to verify that the same character was received. Perform this test on all ports of your serial card to verify the ports can (or cannot) transmit and receive data.

5.Call B&B Electronics' Technical Support at the number/s shown below:

International/USA Office:

(815) 433-5100, 8a.m. - 5:00 p.m. weekdays (Central USA Time).

European Office:

+353 91-792444, 8a.m. – 4:30 p.m. weekdays (UK).

42	Documentation No.3PXCC1x-2x-3903

B&B Electronics Mfg Co – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104	B&B Electronics Mfg Co – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104
B&B Electronics Ltd – Westlink Comm. Pk – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445	B&B Electronics Ltd – Westlink Comm. Pk – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445