15
CHAPTER 2: Introduction
2.3.2 T
HE
R
EAR
P
ANEL
The ServSwitch Professor’s rear panel features two bus connectors, as well as an
RS-232 port, power inlet, and power switch, as illustrated in Figure 2-2 and
described below.
Figure 2-2. The rear panel of a ServSwitch Professor.
Panel Label
Description
BUS IN,
You’ll attach bus cable running to other ServSwitch Professors
BUS OUT
to either or both of these 13W3 female ports. Remember that a
cable attached to one unit’s BUS IN port must be attached to
the BUS OUT port of the unit at the other end, and a cable
attached to one unit’s BUS OUT port must be attached to
another unit’s BUS IN port.
If a unit is the first station on the bus—that is, if there is
going to be (at least for now) a cable attached to the BUS OUT
port but not the BUS IN port—you’ll need to attach a
terminator to the BUS IN port. Similarly, if the unit is the last
station on the bus—if there is going to be a cable attached to the
BUS IN port but not the BUS OUT port—you’ll need to attach a
terminator to the BUS OUT port.
RS-232
RS-232 port reserved for factory diagnostics only. Do
not
attach
any of your equipment to this port.
POWER
You’ll attach the output cord from the included power supply to
this 5-pin DIN female power inlet. This is
not
a keyboard input.
Input voltage is 17 VAC center-tapped.
[None]
There is an unlabeled ON/OFF pushbutton just to the left of
the POWER inlet. Pressing it turns the Professor ON and OFF,
provided that the Professor’s power supply is properly attached to
the inlet.
BUS OUT
BUS IN
POWER
17VAC CT
RS-232
