2.7
Date Code 20020329
SEL-DTA2 Instruction Manual
Specifications
Rear Panel Connections and Configurations
Rear Panel Connections and Configurations
All connections to the SEL-DTA2 are made on the rear panel,
page 5.1 in Section 5: Maintenance and Testing
.
Isolator Input
The SEL-DTA2 has one programmable isolator input for control of transducer
and contact output data from a remote system.
ISO1, the RESET input, clears any analog channels set to indicate fault
location and contact outputs A1–A5. After the output quantities are cleared,
the RST ACK contact output (A6) is closed and remains closed for as long as
RESET is asserted. This input is rising-edge sensitive.
Communications
Ports
The SEL-DTA2 has two EIA-232 communications ports, labeled Port 1 and
Port 2. Connect Port 1 to a personal computer. It is used for changing the
analog output scaling and other settings. Connect Port 2 to the relay port
designated automatic for communications with the relay. See
page 3.2 in Section 3: Communications
for a list of cables that connect to Port 1 and Port 2.
Transducer Outputs
The SEL-DTA2 is equipped with eight programmable transducer channels.
Each of these is available from the rear panel in voltage (–5 to +5 V) and
current (–1 to 1 mA or –5 to 5 mA) form. The instrument also provides a
separate return to ground for each channel. These signals are presented at the
rear panel through a female 25-pin “D” connector, labeled “Analog”.
For systems requiring screw terminal connections, an optional adapter board
is available,
, which breaks a female 25-pin “D” connector out into
screw terminals.
shows the pin assignments. See
page 4.1 in Section 4: Installation
for the cable that connects the analog port
to the terminal block adapter.
Figure 2.9
DB25 to Terminal Block Adapter
1
2 3 4 5 6 7 8 9 10 11 12 13
14 15 16 17 18 19 20 21 22 23 24 25 G
14 15 16 17 18 19 20 21 22 23 24 25 G
"D" connector, female
metal housing
Adapter mounts on
panel using 4 standoffs
