Install and Connect Modems
Task List: Install and Connect Modems
SI Installation and Upgrades
703
June 2004
7
Press Enter when the modem fields are properly administered.
U.S. Robotics Model 839 External Modem Switch Settings
Switch
Setting
Function
1
OFF (Up)
DTR (Data Terminal Ready) override
2
OFF (Up)
Verbal result codes (text-formatted feedback characters such as
connected or no carrier)
3
ON (Down)
Enable result codes
4
OFF (Up)
Displays keyboard commands (local echo)
5
OFF (Up)
Sets auto answer. Verify that the
Auto Answer Ring Count
(rings):
on the maintenance-related system-parameters form is
S0=10
.
6
OFF (Up)
CD (Carrier Detect) override (modem sends CD signal on connect, drops
CD on disconnect)
7
OFF (Up)
Power-on and ATZ reset software defaults (loads Y or Y1 configuration
from NVRAM)
8
ON (Down)
AT (Attention) command set recognition (enables recognition, smart
mode)
SCC1 Modem Fields
Field
Description
Modem
Connection
Default is
none
. Set to
external
if a modem is used.
Modem Name
This field is 20 characters long and permits alphanumeric characters to provide a
unique qualifier for a given modem.
RTS/CTS
Enabled
Informs modem that communication with the data source UART is driven with
RTS/CTS flow control. The default 6-character field name is &H1. Set the field
name to \Q3 for Intel modems. This field is not case-sensitive.
Asynchronous
Data Mode
Configures modem as an asynchronous device. This 8-character field name has a
default value of &M0 (default) for R10 SCC. Set the field to &M0&Q0 for Intel
modems. This field is not case-sensitive.
DTE Auto-Data
Speed
Adjusts the speed of the data source (DTE) UART to the outgoing (modem-to-
modem) data rate. At maximum, this speed is 9600 baud. It is not desirable to
have the serial data fill the modem buffer faster than the outgoing data rate, since
data compression is disabled. The field name has a 6-character blank default
value. The Paradyne products use S90=1 to enable this functionality while the
Intel product uses \J1 to enable similar functionality. This field is not case-
sensitive.