Manual

ATO-400 / ATO-600 Operating Procedures

Table 3.0 Functional Description of ATO-400 Controls and Display

Figure 1

Index #

Adjacent Panel Marking Functional Description

1 & 12 (Wing Nut) Current lead connectors.

2 USB USB connector. USB port is for factory

calibration, firmware updates, and interfacing

with the software program supplied with each

unit.

RS-232C

RS-232C interface port; 9-pin connector;

female DB type. The data are set to 115,200

baud, 1 start bit, 8 data bits, and no parity bit;

PIN ...............SIGNAL

2 Rx

3 Tx

5 Signal Gnd

This serial port is for factory calibration,

firmware updates, and interfacing with the

software program supplied with each unit.

4 HIGH CURRENT

PRESENT

LED indicator, red; Lights when test current

is flowing through the current test leads.

5 No Marking Input power connector with third-wire safety

ground.

6 GROUND

(Wing Nut)

ATO-400 ground stud. Connect ground stud

to substation ground using provided cable.

7 No Marking

Circuit breaker, 25A.

No marking

LCD; 4-line by 20-character; back-lighted;

displays menus of selections, operator entries,

and test-measurement results.

No marking

Operating key-pad controls, 10 alpha-numeric

keys and 6 function keys (START, STOP,

CLEAR, ENTER, & CONTRAST/PAPER

positioning ? & ?).

10 & 11 (Resistor Symbol) Voltage-sensing connector jacks (red).