This chapter provides information used to unpack, pack, and install the
VT102. The installation procedure describes how to select the input voltage
switch and fuse. The chapter also provides a step-by-step power-up
and checkout procedure.
The terminal consists of a video monitor and a detached keyboard. Figure
7-1 shows their dimensions. The following list covers the terminal's environmental
and power specifications.
||10° to 40° C (50° to 104° F)
||10 to 90 percent with a maximum wet bulb temperature
of 28° C (82° F) and a maximum dew point
of 2° C (36° F) noncondensing
||99 to 128 Vac (115 V setting)
198 to 256 Vac (230 V setting)
87 to 107 Vac (100 V setting)
222 to 268 Vac (250 V setting)
When installing the terminal, make sure that all power and signal cables
are free from stress, sharp bends, or obstructions. Also, make sure to provide
access to monitor controls on the back of the terminal.
Several ventilation openings prevent the terminal from overheating. Do
not block the air flow around these openings by placing objects on top of
or under the terminal. Also, do not allow liquids, coins, paper clips, or other
objects to enter these ventilation openings. These objects may damage
You can place the terminal on a desk or tabletop. However, operators
usually prefer the keyboard at standard typewriter-table height rather than
desk height. Terminal tables and stands are available from the DIGITAL
Accessories and Supplies Group (A&SG). (See Chapter 10 for more information
Position the video monitor to avoid reflected light. The screen should face
away from light sources. However, if reflected light is a problem, filter
screens are available from A&SG.
For installations with static electricity problems, static mats are available
Unpacking and Inspection Procedure
The terminal is packed in a carton with the following items.
- AC power cord(s)
- SET-UP label
- User guide
- Programming reference card
Figure 7-2 shows the terminal's packaging. Unpack the terminal from the
shipping carton by using the following procedure.
- Cut the carton sealing tape and open the carton flaps.
- Lift the non-US power cord out of the carton. This power cord is supplied
with some variations of the terminal.
NOTE: All terminals are shipped with a US power cord.
- Lift the terminal out of the carton by using the handles in the packing
material. Place the terminal and packing on its left side (when facing
the front of the terminal).
- Remove the packing material on the right side.
- Remove the keyboard and keyboard cover, then the monitor from the
left-side packing material.
- Remove the plastic bags covering the monitor and keyboard.
- Inspect the terminal for damage.
NOTE: Notify the carrier and your local DIGITAL Sales Office of any
- Install the terminal by using the installation procedure in this chapter.
Pack the terminal for shipment by using the following procedure. Figure 7-2
shows the terminal's packaging. Figure 7-3 shows power switch and
- Turn the power switch off (0).
- Disconnect all cables at the back of the terminal.
- Place the monitor and keyboard in plastic bags.
- Place the packing material for the left side (facing the front of the
terminal) on a flat surface, with the cutouts facing up. Place the monitor
in the large cutout.
- Route the keyboard cable behind the keyboard. Place the connector
in the small cutout.
- Place the keyboard cover over the keys, then place the keyboard
into the small cutout.
- Place the packing material for the right side over the monitor and
- Place the packaged terminal and power cable in the shipping carton.
Fold the carton flaps and tape the carton closed with sealing tape.
Install the terminal by using the following procedure. Figure 7-3 shows
switch and cable locations.
- Perform the unpacking and inspection procedure in this chapter.
- Check the terminal for the correct voltage range selection. The terminal
can operate with either 120 Vac or 220-240 Vac input power.
CAUTION: Failure to select the proper voltage range will damage
A label over the power receptacle indicates the factory-selected input
voltage range. Check this label, the voltage selection switch, and
fuse for the correct voltage range. Make sure the voltage range
matches your local ac power source.
Select 120 volts by performing the following procedure.
- Set the voltage selection switch to 115 (operating range 99-128
Vac). On some terminals, the setting is 100 (operating range 87-107 Vac).
- Remove the fuse holder cap by pressing in and turning counter-clockwise.
Check for a 1.25 A fuse (DIGITAL PN 90-00020-01). Replace
the fuse and fuse holder cap by pressing in and turning
Select 220-240 volts by performing the following procedure.
- Set the voltage selection switch to 230 (operating range 198-256
Vac). On some terminals, the setting is 250 (operating range 222-268 Vac).
- Remove the fuse holder cap by pressing in and turning counter-clockwise.
Check for a 0.75 A slow blow fuse (DIGITAL PN 12-11237-00).
Replace the fuse and fuse holder cap by pressing in
and turning clockwise.
- Remove the backing paper from the self-sticking SET-UP label and
attach to the bottom of the keyboard.
- If necessary, install the 20 mA current loop option (VT1XX-CA). Perform
the option installation and checkout procedures in Chapter 8.
- When using the standard modem connector, selection the internal communication
switches. See Communication Switch Selection in this
chapter when selecting the communication switches.
NOTE: When using the 20 mA current loop option, the terminal ignores
the position of the communication switches.
- Place the keyboard in front of the terminal. Plug the keyboard into the
- Connect the communication cable to the terminal. See Communication
and Printer Cables in this chapter for more information. Also,
see Chapter 6 for information about connector use and signal/pin
- Connect the printer cable to the printer interface connector. See the
sections referenced in step 7.
- Connect the external video device, such as a video monitor, to the
video output connector. The terminal uses a 75-ohm BNC connector.
See Appendix A for detailed specifications for this output.
- Connect one end of the ac power cord to the terminal and the other
end to a nonswitched, grounded receptacle.
NOTE: Make sure the power switch is off (0) before connecting the
- Perform the power-up and checkout procedure in this chapter.
Internal Communication Switch Selection
The terminal has ten internal communication switches to connect or disconnect
modem communication lines. See Chapter 6 for more information
on these communication lines. Select these switches by using the following
- Turn the power switch off (0) and loosen the two captive screws
holding the access cover in place (Figure 7-4).
- Pull the access cover straight out from the back of the terminal, until
loose. Then move the cover to the left, off the supporting studs. Finally,
remove the cover by pulling straight out (Figure 7-5).
- Select the communication switches. The terminal uses one communication
switch pack. However, there are three possible types of
switch packs used; two types use rocker switches and one type
uses slide switches.
To select the rocker switch, press the side of the switch that corresponds
to the desired selection. To select the slide switch, push the
switch tab to the side that corresponds to the desired setting. Figure
7-6 shows the location of the communication switches. Figure 7-7
shows the communication lines connected (on, closed) or disconnected
(off, open) by these switches.
NOTE: Always use a small-blade screwdriver or ball-point pen to
change the communication switches. Never use a lead pencil.
- Install the access cover.
CAUTION: You may damage the access cover by tightening the
captive screws too much.
Communication and Printer Cables
You can order communication and printer cables from A&SG. See Chapter
10 for part numbers and ordering information. Table 7-1 describes each
communication cable used, and Figure 7-8 shows connection examples
for each cable.
Power-Up and Checkout Procedure
A power-up self-test procedure verifies the terminal operation each time
you power up. Power up and check out the terminal by using the following
procedure. See Figure 7-3.
Turn the power switch on (1). The terminal automatically runs the
power-up self-test. The test provides the following indications.
- The terminal displays test data, the wait message, then erases
screen. (The test data and wait message are not visible if the terminal
is not warmed up).
- All keyboard indicators turn on and off, and either the ON LINE or
OFF LINE stays on. The other indicators may stay on or off, depending
on feature selections and received modem signals.
- A bell tone sounds.
- The cursor appears in the upper-left corner of the screen.
When the power-up self-test finds an error, the terminal provides one
of the following indications.
- Does not perform the step 1 sequence.
- Displays character at the cursor position.
- Sounds several bell tones.
See Chapter 9 for more information about self-test failure.
- Enter SET-UP to verify a successful test. A SET-UP display should
appear on the screen. If not call your local DIGITAL Field Service Office.
- If the terminal powers up correctly, select the desired SET-UP features
as described in Chapter 3.
- After you select the SET-UP features, record the feature selections
on the SET-UP label attached to the keyboard.
- Save the SET-UP features by using SHIFT and S. See Chapter 3 for
more information about saving SET-UP features.