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RS-232 Connections to the Controller
The following illustrations show which cables can be used to connect to the
controller. To connect two cables to the 1769-L30 controller, you must connect the
straight cable end to Channel 0.
1769-L20 controller
ATTENTION
!
9-pin, male D-shell straight
cable end
1747-CP3 or 1756-CP3
This cable must be shielded and tied to the connector
housing.
1769-L20, 1769-L30 CompactLogix™ Controllers
NOTE: The Channel 0 port is locally
grounded. Only Channel 1 of the 1769-L30
controller is electrically isolated.
When you connect or disconnect the serial cable while
backplane power is on, an electrical arc can occur. In
hazardous locations, this could cause an explosion.
9-pin, female D-shell
right-angle cable end
1769-L30 controller
1 CD
2 RDX
3 TXD
4 DTR
COMMON
6 DSR
7 RTS
8 CTS
9
straight cable end
Publication 1769-IN047C-EN-P - April 2003
13
1 CD
2 RDX
3 TXD
4 DTR
COMMON
6 DSR
7 RTS
8 CTS
9
right-angle cable end
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