SYSNet™ QS7700A NETWORK INTERFACE ControlBus™ MODULE
63-2284—2
4
3. Recommended wiring for ControlBus™ Module for
communications routing purposes is unshielded 22 AWG,
two-wire twisted cable and one wire for ground, if the
leadwire run and noise conditions permit. If necessary,
Belden 8771 shielded cable or equivalent can be used.
Be aware that the BCS7700 chassis module must be at
one end of the daisy chain and the module on the
farthest end of the daisy chain configuration string require
a 120 ohm, 1/4 watt (minimum) resistor termination
across terminals 1 and 2 of the electrical connectors.
See Fig. 6.
a.
Do not route the ControlBus™ cable in conduit
with line voltage circuits.
b.
Do not route the ControlBus™ cable close to the
ignition transformer.
c.
Route the ControlBus™ cable outside of conduit
if properly supported and protected from damage.
d.
Route the ControlBus™ cable so that all devices
are connected in a daisychain(A-A, B-B, C-C).
The BCS 7700 Chassis Module must be at one
end of the daisy chain configuration string. The
interconnection of all other devices is not
important, except that the device at the distant
end of the daisy chain configuration string must
be terminated with a 120 ohm, 1/4 watt resistor
between terminals A and B.
4. Maximum wire lengths can be 4000 ft (1219m) for the
ControlBus™ RS-485 interface under ideal conditions.
Procedure
���
Refer to Fig. 6 for proper wiring.
���
Be sure that power is removed from the control panel
by opening the main disconnect before beginning wiring
to the electrical connectors. More than one
disconnection can be involved.
���
Select the location of the Network Interface Unit to be
mounted:
a.
Near a phone line.
b.
Within 4000 ft (1219m) of all BCS 7700s that will
be connected to the Network Interface Unit.
c.
Within 50 ft (15m) of the personal computer that
will be connected to the 25-pin RS-232 port of the
Network Interface Unit.
���
Mount the Network Interface Unit and insert the
ControlBus™ Module into the Network Interface Unit
slot, see Fig. 2 and 5.
���
Route the ControlBus™ cable so that all devices are
connected in a daisychain (A-A, B-B, C-C). The BCS
7700 Chassis Module must be at one end of the daisy
chain configuration string. The interconnect of all other
devices is not important, except that the device at the
distant end of the daisy chain configuration string must
be terminated with a 120 ohm, 1/4 watt resistor
between terminals A and B. Remove any other
termination resistors and install a 120 ohm, 1/4 watt
resistor at the final device in the string.
���
Connect L1, L2 and Ground (GND) to the pigtails
(Q7700A
only).
���
Connect the 5-pin DIN connector cord, from the
switching power supply, to the 5-pin DIN conctor on the
Network Interface Unit. Connect the IEC power cord,
from the switching power supply, to a line voltage
source (Q7700B only).
Fig. 2. ControlBus™ Module mounting.
M7437B
ELECTRICAL
CONNECTOR
EDGE
CONNECTOR
CONTROLBUS
MODULE
NETWORK
INTERFACE
UNIT
Fig. 3. RS-232 Interface insertion
(serial communications).
25-PIN
RS-232C
CONNECTOR
NETWORK
INTERFACE
UNIT
M7432B
���
Insert the plug-in card slots into any open slots of the
Network Interface Unit.
���
Install the covers, power wiring compartment and
Network Interface Unit.
쐅
Connect the serial port of the modem to the 9-pin
RS-232 connector of the Network Interface Unit
(see Fig 4).
쐈
Connect the serial port of the personal computer to the
25-pin RS-232C port on the Network Interface Unit for
local personal computer application, see Fig. 3.
쐉
Do not exceed 600 mA current draw, six card
maximum, total capacity of the plug-in cards. Refer to
the ControlBus™ Module device label and this
specification for individual loads.
씈
Check all wiring with Fig. 6 before installing an
electrical connector.
씉
Install all electrical connectors.
씊
Restore power to the Network Interface Unit.