Rockwell Automation 2706-F11J_F11JC_F21J_F21JC DL50 INSTALLATION MANUAL User Manual

Page 38

Chapter 4

Installing the DL50

4–13

Figure 4.10 shows a typical connection between a host device RS-232 port
and the DL50 display.

We recommend that you use Belden 9842 cable.

The DL50 display is considered a “DTE” (Data Terminal Equipment) device.
The connection diagram assumes that the RS-232 port of the host device is
also a “DTE” type, as most are. If instead it is a “DCE” (Data
Communications Equipment) type, you should interchange the wires on
pins 2 and 3.

We recommend that you connect the shield at the one end only, as shown.

Note: If noise problems occur between a DL20 master display and a DL50
display when RS-232 communications are used, we recommend that you
connect the shield of the communication cable to chassis ground at both
ends. However, the earth ground for each device must be at the same
potential.

Figure 4.10
RS-232 Connections

Equipment Ground

Transmit

Receive

Signal Common

RS-232 TxD (Transmit)

RS-232 RxD (Receive)

Ground

DL50

RS-232 TERMINALS

TYPICAL HOST DEVICE

(25-pin) (DTE)

Note: Some devices require that certain hardware hand-
shaking lines be asserted.

This may require a jumper between the CTS and RTS
terminals. Refer to the applicable product literature.

T -

R-

G-

Cable, Belden 9842