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3-26 Chapter 3
RS-422 Null-Modem Cable
DCP PORT
1
z
CHASSIS GROUND
z
1
2
z
TRANSMIT DATA (A) TRANSMIT DATA (A)
z
2
3
z
RECEIVE DATA (A) RECEIVE DATA (A)
z
3
4
z
REQUEST TO SEND (A) REQUEST TO SEND (A)
z
4
5
z
CLEAR TO SEND (A) CLEAR TO SEND (A)
z
5
7
z
SIGNAL GROUND
z
7
9
z
RECEIVE CLOCK (B) RECEIVE CLOCK (B)
z
9
12
z
TRANSMIT CLOCK (B) TRANSMIT CLOCK (B)
z
12
13
z
CLEAR TO SEND (B) CLEAR TO SEND (B)
z
13
14
z
TRANSMIT DATA (B) TRANSMIT DATA (B)
z
14
15
z
TRANSMIT CLOCK (A) TRANSMIT CLOCK (A)
z
15
16
z
RECEIVE DATA (B) RECEIVE DATA (B)
z
16
17
z
RECEIVE CLOCK (A) RECEIVE CLOCK (A)
z
17
19
z
REQUEST TO SEND (B) REQUEST TO SEND (B)
z
19
Figure 3-20