Total Access 3000 23-Inch Chassis Installation and Maintenance Practice
24
61181001L1-5E
2. Using the wire-wrap tool, connect the shielded, twisted pair interconnect wire to the
RS-485 wire-wrap header,
P2
, on the host Total Access 3000 backplane. Connect the two
conductors to the
A
and
B
“Out” pins, and the shield or drain wire to the “Out” ground
pin.
3. Run the interconnect wire to the backplane of the first client shelf. Using the wire-wrap
tool, connect the two conductors and ground of the interconnect wiring to the RS-485
wire-wrap header,
P2
, on the backplane of the client shelf. The two conductors will be
wired to the
A
and
B
“In” pins, and the ground or shield wire will be cut without
connecting to the ground pin. Note that only one end of the grounding wire should be
connected between the two shelves. Take care to connect the A pins of each shelf together,
and the B pins together. Do not cross the polarities.
4. If there are more shelves to be connected, repeat steps 1 through 3 for each shelf to be
added to the chain. Disregard the designation of host and client for additional shelves.
Each shelf after the first will be a client shelf on the daisy chain. It is important to note
that there is only one shelf designated as host on any daisy chain of up to 32 shelves and
that the host is on the end of the chain.
illustrates the connecting of the RS-485 bus between shelves.
Figure 11. Total Access 3000 Interbank Connections
P2
IN
OUT
RS485
A B
A B
P2
IN
OUT
RS485
A B
A B
Client Chassis
32
Client Chassis
31
Client Chassis
2
UP TO 32 CHASSIS
Client Chassis
1
P2
IN
OUT
RS485
A B
A B
P2
IN
OUT
RS485
A B
A B
