The Acc Hand-Held Terminal Interface; Hht Hardware Overview; Keys And Functions - Emerson Control Link Installation And Operation Manual

8 The ACC Hand-
Held Terminal
Interface
8.1. HHT Hardware
Overview
1
14
13
12
11
10
Power Switch
1
2 External Power Connector (9-12 VDC)
3 Function Key F2
4
Up Arrow
5 Right Arrow
6 Enter Key
7 Numeric keypad
Figure 8-1 - Hand-Held Terminal
The power switch determines the power mode of
the device, whether if self-powered (BATT), external
powered (EXT), or powered by a target device
(HOST).
The LCD screen can display up to 4 lines of
characters (each line can hold 16 characters). It
displays the home screen and the different menu
screens of the HHT. The LCD serves also as a visual
indicator that the HHT is functioning.

HHT Hardware Overview

2
3
4
5
6
7
8
9
LEGEND
Period and Minus Keys
8
9 RS-485 Connector
10 Cancel Key
11 Down Arrow
12 Left Arrow
13 Function Key F1
14 LCD
The RS-485 port supports the following:
• Standard dumb terminal mode protocol
• PL-430 version of I/O net
• I/O Net
• MODBUS

8.2. Keys and Functions

Key
F1 Key Returns you to the Home Screen.
F2 Key Takes you to the Main Menu
Enter Saves your settings into the memory
Cancel Clears/Erases texts in the editable
field; cancels overrides
Left Arrow Selects the first editable field from
top of screen, and the next editable
field from top to bottom
Right Arrow Selects the last editable field starting
from the bottom of the screen; and
the previous editable field from
bottom to top
Down Arrow Moves to the next screen, editable
field, end of screen, or advances
Up Arrow Go back to previous screen, editable
field, or top of screen
Period Key Scroll list selections and scroll
through ASCII characters if in a text
Minus Key
field
Number Keys Choose a menu option or enter a
value
(numbered 0-9)
Table 8-1 - HHT Keys and Functions
The ACC Hand-Held Terminal Interface • 21
Functions