User's Guide
Table Of Contents
- Table of Contents
- About This Document
- 1. Introduction
- 2. Installation
- 3. Configuration and Operation
- 4. Troubleshooting
- A. AT Command Set
- B. Dial Modifiers
- C. S-Registers
- D. Isolating Problems Using Loopback Data Tests
- E. Quick-Reference Summaries
- Glossary
- Index
8400B Plus Data Module User’s Guide
555-020-709
Issue 2
November 1996
AT Command Set
A-26
Command: &T
Function: Control diagnostic and test facilities.
Type: immediate
Arguments: The &T command accepts one of eight arguments (see
comment 2) as follows:
0 — (or no option) terminate any test in progress (see
comment 3).
1 — initiate local loopback test.
2 — same as 1.
3 — initiate local data loopback test.
4 — allow remote loopback requests from the remote
system (factory-default selection).
5 — deny remote loopback requests from the remote
system.
6 — initiate remote loopback test.
7 — initiate remote loopback test with self-test.
8 — initiate local loopback test with self-test.
S-Register: Bits 0 and 2—6 of S16 are set according to the
argument used with the &T command.
Example: AT&T3
(see comment 1)
Table A-1. Accepted AT Command Labels
Label Description
ENTER
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