DSP9612RM USER’S GUIDE
0049-0519-000
Page 14
REV.D
SW2-7
⎯
Remote Loopback
SW2-7
ON = Loopback enabled
OFF = Loopback disabled
During instances of channel noise, the modem may mistake a received preamble as a
request to go into remote digital loopback. Setting SW2-7 to OFF prevents the modem
from participating in a remote digital loopback with another modem. SW2-7 does not
prevent the modem from sending a remote digital loopback request to a remote modem.
SW2-8
⎯
Reserved (Test Only)
SW2-8
Must be OFF
SW2-8 must be in the OFF position for normal operation.
SW3 DIP Switch Settings
SW3 is a 10-position DIP switch. Table 2-5 shows the modem switch settings for DIP
switch SW3. A description of the SW3 switch settings follows the table.
Table 2-5. Modem Switch Settings for DIP Switch SW3
Switch Settings
Switches
ON
OFF (Default)
SW3-1: Fast Poll/FSK (page 15)
FSK
Fast Poll Auto-
Rate
SW3-2: Data Rate (page 15)
4800 bps
9600 bps
SW3-3: Async Character (page 16) 11 bits
10 bits
SW3-4: Auto RTS (page 15)
Enabled
Disabled
SW3-5: Transmitter Termination
(page 16)
Switched by RTS
600
Ω
SW3-6: Reserved (Test Only)
(page 16)
Test Normal
SW3-7: 2- or 4-wire (page 17)
2-wire, half-duplex
4-wire, full-
duplex
SW3-8: Carrier Control (page 17)
Constant
Switched
SW3-9: Rx Termination (page17)
600
Ω
High Rx
Impedance
SW3-10: Signal Ground and Earth
Ground Option (page 17)
Connected Separated
