Rockwell Automation 8520 9/Series CNC Integration Maintenance Manual Documentation Set - Manual (Page 434)

Section
8
8-1
Communication Interface
This section covers the connection of peripherals to the control. The
following types of interfaces to connect the peripherals to the control:
RS-232 (ports A or B)
RS-422 (port B only)
For Information on: See Page
RS-232 Interface 8-1
RS-232 Signal Description 8-2
Connection of Peripherals 8-3
RS-422 Interface 8-6
RS-422 Description 8-7
Connection of Peripherals 8-9
Protocol 8-9
RS-491 Level 1 Protocol 8-11
Peripherals 8-15
RS-232 is a common serial interface that uses a single return line for all
signals. This interface is often called single ended serial communication
because of the single return line and because the “True” (High) and “False”
(Low) data bits are positive and negative voltages referenced to the
common return.
Control Port A and location Port B and location
9/230 ---- RS-232/422 on the processor
board
9/260 RS-232 on the CPU Module RS-232/422 on the
motherboard
9/290 RS-232 on the CPU Module RS-232/422 on the
motherboard
9/440 RS-232 bottom of system
module
RS-232/422 bottom of system
module
When you select RS-232, the interface cable cannot be longer than 50
cable feet (15 meters). The length of the interface cable should be kept as
short as possible and should be shielded to reduce the possibility of noise
interference.
8.0
Section Overview
8.1
RS-232 Interface