Bilateral Test Enable/Disable (*An, *Dg); Dte-Controlled Remote Digital Loopback (Pin 21) (*Rd); Dte-Controlled Local Analog Loopback (Pin 18) (*La) - Black Box 325 User Manual

6.10.1 B T
ILATERAL EST
Enables or disables bilateral test function.
Command
*AN
*AN1
*DG
*DG1
†default
6.10.2 DTE-C
ONTROLLED
To enable DTE-controlled remote digital loopback, enter AT*RD1. When the test is enabled, the modem
goes into remote digital loopback when it detects an off-to-on transition of pin 21 while in the online data
mode. The test ends when it detects an on-to-off transition of pin 21 and then returns to online data
mode. To disable this function, enter AT*RD.
Table 6-15. DTE Controlled Remote Digital Loopback (Pin 21) (*RD).
Command
*RD
*RD1
†default
If the test timeout option is enabled and pin 21 remains high, the modem returns to online
mode at the end of the test timeout period and then immediately reenters the test mode.
6.10.3 DTE-C
ONTROLLED
To enable DTE-controlled local analog loopback, enter AT*LA1. When the test is enabled, the modem
goes into local analog loopback when it detects an off-to-on transition of pin 18. The test ends when it
detects an on-to-off transition of pin 18. To disable the test, enter AT*LA.
E /D (*AN, *DG)
NABLE ISABLE
Table 6-14. Bilateral Test Enable/Disable.
Operation
Bilateral analog loop disabled†
Bilateral analog loop enabled
Bilateral digital loop disabled†
Bilateral digital loop enabled
R D L
EMOTE IGITAL OOPBACK
Operation
Ignore pin 21†
RDL enabled (pin 21)
L A L
OCAL NALOG OOPBACK
CHAPTER 6: Asynchronous Operating Commands
(P 21) (*RD)
IN
NOTE
(P 18) (*LA)
IN
7 1