■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■
▼
Signal Connection to External Devices
DS1104 Hardware Installation and Configuration March 2004
139
▲
■■■■■■■■■■
I
▲
■
■■■■■■■■■■■■■■
Because RS422 allows only one transmitter in the bus, the termination
resistor is placed only at the end of the cable near the last receiver (see
figure below).
The termination resistor Z
T
, must be within 20% of the characteristic
impedance of the cable (Z
0
) and can vary from 90
Ω
to 120
Ω.
TXD
DS1104
(RS422 mode)
TXD
Z
T
RXD
RXD
RXD
RXD
T
T = Transmitter
R = Receiver
R
R
RXD
RXD
R
Summary of Contents for CLP1104
Page 6: ...Contents DS1104 Hardware Installation and Configuration March 2004 I 6 ...
Page 20: ...Safety Precautions DS1104 Hardware Installation and Configuration March 2004 I 20 ...
Page 118: ...Mapping of I O Signals DS1104 Hardware Installation and Configuration March 2004 I 118 ...
Page 162: ...Data Sheets DS1104 Hardware Installation and Configuration March 2004 I 162 ...