B&B Electronics 3PCI2 User Manual
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Chapter 7
Documentation Number 3PCI2-0903 Manual
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
3.
Run Setup.exe to install COMTest on your program menu
under B&B Electronics.
4.
Check your Card Jumpers, and Driver Settings. See Chapter 2.
5.
Make sure you have DTR Operation set to the correct mode.
Normal for RS-232, RS-485 Mode for RS-485. RS-422 mode
works in either setting provided that the mode jumpers are set
correctly.
6.
A loopback connection for RS-232 connects the Transmit
output to the Receive input (pins #2 & #3 on the DB9
connector). Use connections below to check all.
Fig. 7.1 RS-232 Loopback w/Handshaking Connections
7.
For RS-422 or 4-wire RS-485, connect the TD(A) to RD(A) and
the TD(B) to RD(B). Then use the COMTest program to send
characters, and observe the characters being received.
Fig. 7.2 RS-422 or 4-wire RS485 Loopback Connections