CM4 Four-Point Continuous Monitor
CM4 Technical Manual
D-9
D.5 Other Applications
The serial printer interface is designed for unidirectional communication
from a CM4 monitor to a single printer or other remote device. It is
possible, therefore, that the application for this interface requires
connection to a remote device other than the printer options described
in this appendix.
CAUTION
Cabling used between the CM4 monitor and the external device must
be shielded and properly grounded to maintain reliable operation and
control RF emissions and susceptibility
For these applications, note the pin-out configuration in each of the
diagrams.
Single CM4 monitor to Display Terminal
CM4
Monitor
COM2
Display
Terminal
Male DB-25
to Display Terminal
Male DB-9
to CM4
3 RX
7 Signal Gnd.
20 DTR
5 CTS
TX 2
Signal Gnd. 5
RTS 7
CTS 8
Cable Pinout
Interface
RS-232 P/N 874201-R Rear Panel Mount
Jumpers
See
for DCE settings
Display
Terminal
User-supplied
Cable
User-supplied. Refer to diagram for pin-out configuration.
Also, refer to the EMC Considerations section on page
Note
Maximum range: 50 Ft.
Other
Applications
The serial printer interface is designed for unidirectional communication
from a CM4 monitor to a single printer or other remote device. It is
possible, therefore, that your application for this interface requires
connection to a remote device other than the printer options described
in this document.
In this configuration, a terminal emulates the printer by displaying the
ASCII text for concentrations, faults, and alarms on its screen. It is
not possible to interrogate the Model CM4 through this printer port.
Bidirectional communication is possible (not in ASCII) by using the
CM4 serial communications port.
The default setting (disabled) of the Model CM4’s hardware flow
control needs only two wires to be connected between the CM4 (Pin
2 and Pin 5) to the terminal.
If you are connecting a device other than the printer options described
in this technical note, use the following pin-out configuration on the
connector cable. Also, refer to the EMC Considerations section on
page
Figure D-5: Serial Interface, Single CM4, Display Terminal
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