Tektronix DOM1 Digital Output Module Rev. B User manual
DOMI
Digital Output Module
The DOMl Digital Output Module offers 16 channels of optically isolated digital output.
These channels are factory configured as TTL compatible voltage outputs. By removing
resistors and jumpers, output may be configured as switches. Functioning as switches,
the output channels can control loads up to +28V.
Digital output channels are grouped into two ports of eight channels; each port treated
as a single byte from software. This grouping allows simultaneous updating of up to
eight channels, and enables communication with 4 and &bit TTL devices.
Digital Output Modules can be installed in any slot of the Series 500. To install the
module, remove the top cover and install the board with the components facing the
power supply.
CAUTION: Always turn off the mainframe power before installing or removing
modules. To minimize the possibility of EM1 radiation, never operate the system with
the top cover removed.
User-Configured Components
The DOMl is factory configured to provide isolated TTLcompatible outputs. In this
configuration, external +5V and ground wires must be connected to respective module
terminals. By moving the positions of two jumpers (Wll.7 and Wllg), The module can
also be used in a non-isolated TTLcompatible configuration that uses the module’s own
+5V and ground connections.
Resistors to ground and wire jumpers to +5V may be removed to configure individual
outputs as switches, thus allowing circuits with potentials as high as 28V to be
controlled.
Connections to the module are made to screw terminals located along the top edge of
the module. Each terminal accepts 16-24 gauge wire leads. Used-configurable components are summarized in Table 1.
Document Number: 500-935-01 Rev. B
DOMl-1
Table 1. User-Configured Components
Component
Resistors 103-118 R103-R118 Configured output for TTL
Jumpers 101-116 WlOIWll6 Configures output for TTL
Screw Terminals Jl37
Internal +5V, Part of Jl37 Connects to module supply
Ground
External +5V,
Ground
Jumpers 117-118 4117, Wll8 Sets module for external (isolated) or internal (non-
Designation Function
Positive and negative output connections
Part of Jl37
Connect to external supply
isolated) operation
Figure 1. DOMl Module Configuration
DOMl-2
Connections
A terminal strip containing all module connecting points is located at the top of the
board. In addition to (+) and (-) connections for each of the 16 channels, there are also
terminals for both internal and external +5V ground connections. These terminals are
marked on the board. A typical connecting scheme is illustrated in Figure 2.
CAUTION: Use shielded cable to minimize EM1 radiation. Connect one end of the
shield to internal or external ground depending on module configuration as described
below.
WARNING: User-supplied lethal voltages may be present on the terminals.
‘ERNAL SUPPLY
Figure 2. Connections for Isolated TTL Outputs
As shipped, the DOMl module is configured for isolated TTL outputs. With this configuration, external +5V and ground must be connected to the appropriate terminals.
See Figure 2 for typical connections. Note that signal high is connected to the (-) chan-
nel of the output, while signal low is connected to external ground.
By moving Wl17 and Wll.8 to the internal positions, the module can be converted for
use with the Series 500 system supply. With this configuration, signal high would be
connected to the (-) terminal of the channel in question, while signal low would be
connected to module ground.
Note that the module draws 6OOmA when configured to operate in the internal mode.
This factor may be reduced to about 350mA when operating from an external supply.
Conversion to Switching Outputs
Each channel on the DOMl module may be individually converted into a switching
output that will control up to 28V. To convert a channel, remove the 2203 resistor and
DOMl-3
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