Satec PM172EH series - Page 70

64 Chapter 7 Communications
Computer Connections COM2 - RS-422/RS-485
R1, R2
≅
200-500 Ohm,
0.5 W
Figure 7-9 RS-422 Multidrop
Connection, 25-Pin PC Port
R1, R2
≅
200-500 Ohm,
0.5 W
Figure 77-10 RS-422 Multidrop
Connection, 9-Pin PC Port
R1, R2
≅
200-500 Ohm,
0.5 W
Figure 77-11 RS-485 Multidrop
Connection, 25-Pin PC Port
c98-10007/4
R1, R2
≅
200-500 Ohm,
0.5 W
Figure 77-12 RS-485 Multidrop
Connection, 9-Pin PC Port
NOTE: Where an RS-232/RS-422 converter is used, R1 is not applicable
since it is built in to the converter.