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7.7 Termination Resistors
Optional line termination resistors are provided for the input signals of each of the
DS-200/300’s RS-422/485 ports. The user has the option of selecting RS-422
termination (100W), RS-485 termination (120W), or no termination. Line
termination may be selected or removed using jumper block J1. The board is
shipped with no termination selected.
8-16
120W
7-15
100W
Serial 1AUXIN
6-14
120W
5-13
100W
Serial 1RXD
4-12
120W
3-11
100W
Serial 0AUXIN
2-10
120W
1-9
100W
Serial 0RXD
PINS
JUMPERED ON
J1
TERM SIZECHANNELSIGNAL
Figure 24 --- RS-422/485 Line Termination
J1
1
2
345
6
7
8
10
11
13
14
1516
12
9
Figure 25 --- Line Termination Option Block
7.8 RS-422/485 Peripheral Connection
The DS-200/300 connects to peripheral equipment through two female D-9
connectors. The serial port connector definitions are listed in Figure 28.
DS-200/300 User's Manual 7-6