B3000-B Serial Brains User’s Guide
3
3
2: Configuration and
Communication
This chapter describes the B3000-B or B3000-B-OMUX serial port, how to set up serial networking, how to set
the address and communications options for the brain, and how the brain addresses the I/O.
SERIAL PORT
The communications port on a B3000-B brain (both models) is RS-485, either 2-wire or 4-wire. Baud rate,
termination, and address are set using the switches on the brain’s top cover. To configure the brain, see the
next section,
“Setting Up Serial Networking.”
For serial cable recommendations and wiring, see
Wiring of IRQ + and IRQ - (pins 6 and 7) is optional and is only needed when using
mistic
interrupts.
Setting the Address and Communication Options
(below)
Serial port connector pinout
Pin 1
TX/RX+
TX/RX–
COM
RX+
RX–
IRQ+
IRQ–
