4.4.2 REMOTE DAISY CHAIN TOPOLOGY
In some applications it may be desirable to control a local rack and
a remote rack using the same local RS-232 terminal. This can be
accomplished using two of Patton’s RS-232 short range modem cards
in addition to the Model 1001CCs.
Figure 5 (below) shows how a remote daisy chain set-up might look. It
is also possible to combine this remote daisy chaining method with the
local daisy chaining method described in Section 4.4.1.
To wire up a remote Model 1001CC daisy chain connection, follow
these steps:
1) Using a straight through modular cable, connect the serial
port of the RS-232 terminal to Port A1 of the local Model 1001CC.
2) Using a
straight through modular cable, connect Port B1 of
the local Model 1001CC to port A1 to the RS-232 port of a Patton
asynchronous short range modem card (ex. the Model 1000RC).
3) Following the instructions in the User Manual for the particular
Patton short range modem card you are using, connect the “line”
port of the local short range modem card to “line” port of the remote
short range modem card. This connection should be made in the
normal manner, using twisted pair cable.
4) Connect the serial (RS-232) port of the remote Patton short
range modem card to Port A1 of the remote Model 1001CC. Since
both ports are configured as DCE, you will need to use a modular
RJ-45
crossover cable pinned in the following manner:
RJ-45 Crossover Cable (4-Wire)
SIGNAL
PIN#
PIN#
SIGNAL
DSR
2-----------------------4
DTR
DTR
4-----------------------2
DSR
RD
6-----------------------7
TD
TD
7-----------------------6
RD
GND
5-----------------------5
GND
9
10
Figure 5. Remote daisy chain
