Rockwell Automation 2706-F11J_F11JC_F21J_F21JC DL50 INSTALLATION MANUAL - Manual (Page 44)

Chapter 4
Installing the DL50
4–19
The DL50 display may be connected to personal computers through an
RS-232 port. Either Simplex or Duplex protocol may be used in applications
with a personal computer as host.
•
For single-point connections of 50 feet or less, the DL50 RS-232 port
may be connected directly to the personal computer RS-232 port. See
Figure 4.16.
Figure 4.16
Personal Computer to DL50 RS-232 Port
RS-232 TxD (Transmit)
RS-232 RxD (Receive)
Signal Ground
DL50
RS-232 TERMINALS
T -
R-
G-
1
2
3
Signal Ground
RS-232 RxD (Receive)
RS-232 TxD (Transmit)
5
3
2
Computer
RS-232 port
DB-9 Connector
•
For installations greater than 50 feet, or for multi-drop networks
containing multiple DL50 displays, the personal computer can be
connected to a DL50 RS-485 network through a multi-point RS-232 to
RS-485 converter. See Figure 4.17.
A multi-point converter is used for:
•
single DL50 installations with a cable length over 50 feet, or
•
multi-drop network containing multiple DL50 displays.
Any RS-232 host (such as a personal computer) can be connected to a DL50
RS-485 network through a multi-point RS-232 to RS-485 converter such as
Black Box Corporation’s Model LD485A-MP.
Note: The output of LD485A-MP is a half-duplex RS-485 network that
will support up to 32 multi-dropped DL50 displays. Up to 100 DL50
displays can be connected when line drivers are installed.
Connection to Personal
Computers