7
4.0 CONFIGURATION
The Model 1200 is equipped with four strapping options that allow config-
uration to a wide range of applications. To gain access to the internal
straps, loosen the hex nuts on the DB-25 connectors and pry open the
case between the plastic shell ears. Figure 2 shows the location of each
strapping option.
Figure 2.
Strap settings for the Model 1200/1201
4.1 DATA RATE
The data rate strap controls the rate at which data is transmitted. Adjust
the strap to select one of the following options: 1.2, 2.4, 4.8, 9.6, 19.2,
38.4 or external clocking. If “external clocking” is selected, the Model
1200 will automatically match the clocking between your two synchro-
nous devices. The default setting is 9.6 Kbps.
4.2 CARRIER DETECT
The carrier detect straps allow you to determine whether the carrier is
“constantly on” or “controlled by RTS”. By adjusting the strap, you may
operate in switched carrier, multi-point and/or hardware handshaking
applications. Port 1 and port 2 may be configured separately. The
defaults setting is “on” for both ports.
Data Rate
Carrier Detect
Port 1
Port 2
38.4 kbps
19.2 kbps
9.6 kbps
4.8 kbps
2.4 kbps
1.2 kbps
External Clock
Port 1
Port 2
0 mSec
6.6 mSec
53 mSec
Constant
Port 1 Frame
Ground connects
to signal ground
Port 2 Frame
Ground connects
to signal ground
RTS/CTS Delay
Ground
Controlled
