Quatech SSCLP-300 - Manual (Page 9)

2 Hardware Configuration
The DSCLP-200/300 is automatically configured at boot time by the
computer's BIOS or operating system. There are no required switches or jumpers
to set for installation.
This chapter lists a number of optional jumper settings that control various
hardware features. Jumpers J1-J4, located in a column near the D-type connector
(D-25 for DSCLP, D-9 for SSCLP), control the RS-422 or RS-485 signal line
termination. Jumpers J5-J8, located in a column just to the right of J1-J4, control
how signals are routed from the UARTs to the connector, as well as full- or half-
duplex operation. Jumpers J10-J22, grouped together at the end of the board
opposite the D-type connector (D-25 for DSCLP, D-9 for SSCLP), control special
options.
Any changes from the factory default should be made before installing the
DSCLP-200/300 in the computer. These settings can also be changed in Device
Manager under Windows operating systems.
2.1 RS-422 or RS-485 Signal Line Termination
Jumpers J6-J9 allow the selection of 100-ohm RS-422 termination,
120-ohm RS-485 termination, or no termination at all. The factory default, shown
in Figure 1, is RS-422 termination. For full details, see section 7.6.
1 3
RS-422 termination
(100 ohms)
(factory default)
Jumpers J6-J9
4 2
Figure 1 --- Factory default signal termination settings
DSCLP/SSCLP-200/300 User's Manual 9