6
Chapter 2
Documentation Number 3PCIO1-0903 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
Selection of Operating Mode
The hardware address and IRQ is set by the Windows Operating
System using driver information files and the Plug and Play OS.
The Operating Mode is set using Jumpers, Device Manager Driver
Settings and by your cable connections and software.
Set the Jumpers
Set the 3 JP1 Jumpers to match your Operating Mode.
Jumpers
RS-232
RS-422
4-Wire
RS-485
4-Wire
RS-485
2-Wire
JP1 Top
232
(Right)
422/485
(left)
422/485
(left)
422/485
(left)
JP1 Middle
-----
No effect
TX ENABLE
(right)
TX SD
(left)
TX SD
(left)
JP1 Bottom
-----
No effect
RX ENABLE
(right)
RX ENABLE
(right)
RX SD
(left)
Table 1 – Jumper/Mode Table
The top jumper sets DB9 connections for either 232 or 422/485
RS-232 operation requires setting only the Top jumper.
The middle jumper sets the RS-422/RS-485 transmitter for RS-485
or RS-422 operation
. In RS-485 mode, the transmitter is tri-stated
when not sending data.In RS-422 mode, the transmitter is always
enabled.
The bottom jumper sets the RS-422/RS-485 receiver for half-duplex
RS-485 operation or full-duplex RS-422/RS-485 operation
. In Half
Duplex RS-485, the Receiver is Enabled when not transmitting. In
Full Duplex RS-422/485 operation, the receiver is always enabled.
For more operating mode information, see the related chapter.
