2 rs-232 signal description – Rockwell Automation 8520 9/Series CNC Integration Maintenance Manual Documentation Set User Manual
Page 435

Section 8
Communication Interface
8-2
RS-232 sends and receives the signal codes in Table 8.A to and from the
control. The control is a data communication equipment (DCE) device.
Table 8.A
RS-232 Connector Pin Assignment Port A
Pin No.
Signal Code
Signal Name
Signal Type
Description
1
SH
Shield
--
Shield
2
SD
Send Data
Input
This line is used to carry data sent from a
peripheral device to the control.
3
RD
Receive Data
Output
This line is used to carry data that is sent
from the control to a peripheral device.
4
RS
Request To Send
Input
The peripheral turns this line “ON”to
request the control send it data.
5
CS
Clear To Send
Output
The control turns this line “ON”to
request the peripheral send it data
6
1
DSR
Data Set Ready
Output
The control turns this line “ON”when
power to the control is applied.
7
GND
Signal Ground
--
Signal Line Ground
1
Port B Only
Table 8.B indicates the signal conditions for control signal ON/OFF status.
Table 8.B
Control Signal Status
Signal Conditions
Mark
Space
Control Signal
OFF
ON
Logic
1
0
Signal Level
-3 to -15V
+3 to +15V
8.2
RS-232 Signal Description
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