Section 3: Cdl Connection; Section 4: Cdl Gateway™ Host Connections - Monico CDL Gateway Installation And Operation Manual

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Section 3: CDL Connection to the Engine
Connection to the Data Link is via the RJ-45 Jack (Figure 3.1). The CDL is a differential
buss that is relatively noise immune, but care must be taken not to create ground loops and
good wiring practices are critical. This RJ-45 port has built-in receive (Rx-red) and transmit
(Tx-Green) LED lights which will show transmit and receive activity. If there is no action
with these lights after 5-10 seconds, then the Data Link is not active or not present. Please
note that the Caterpillar panel must be powered on for the data link to be active. If the Rx
light is on solid, then the CDL connections are reversed or the cable length is too long. If the
cable is too long, you may need to add a resistor across the terminals on the CDL Gateway™
side of the connection to lower the cable impedance. Before trying this, consult the factory.
Be sure the Gateway is powered using and isolated 24 VDC source and the EMC wiring
guidelines listed in Section 1 are followed or the properly grounded engine batteries.
Figure 3.1 CDL Connection Pin #7=CDL (+); Pin#8=CDL (-)
Section 4: CDL Gateway™ Host Connections
The Host device (PLC, HMI, Building Management System, etc.) is connected to the
Gateway through one of three host ports. The Gateway offers one RS 232 port (RJ-11 Jack);
one RS-485 port (RJ-45 Jack) and one Ethernet Port (RJ-45 Jack-Shielded).
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