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CHAPTER 4: Ground Strap and Pin Connections
9
4. Ground Strap and Pin Connections
4.1 Ground Strap
Signal grounds (Pins 19, 20, and 37 on the 422 interface and Pin B on the V.35 interface) are connected
together, but not connected to chassis ground (Pin A). However, for applications requiring the grounds
at a common reference point, the grounds can be connected by installing a jumper strap across W3
located at the rear of the printed circuit board between J1 and P1.
Figure 4-1. V.35 Interface
Figure 4-2. RS-422 Interface.
B
D
F
J
L
BB
R
T
V
X
SIGNAL GROUND
CLEAR TO SEND
RECEIVE LINE SIGNAL DETECT
LOCAL LOOPBACK
TEST PATTERN
REMOTE LOOPBACK
RECEIVED DATA
RECEIVED DATA
RECEIVE TIMING
RECEIVE TIMING
CHASSIS GROUND
REQUEST TO SEND
DATA SET READY
DATA TERMINAL READY
TEST MODE
REMOTE LOOPBACK
TRANSMITTED DATA
TRANSMITTED DATA
TRANSMIT TIMING
TRANSMIT TIMING
A
C
E
H
K
AA
P
S
U
W
YTRANSMIT TIMING
TRANSMIT TIMING AA
RECEIVE COMMON 20
21
SEND DATA 22
SEND TIMING 23
RECEIVE DATA 24
REQUEST TO SEND 25
RECEIVE TIMING 26
CLEAR TO SEND 27
28
DATA MODE 29
TERMINAL READY 30
RECEIVER READY 31
32
33
34
TERMINAL TIMING 35
36
SEND COMMON 37
1 SHIELD
2
3
4 SEND DATA
5 SEND TIMING
6 RECEIVE DATA
7 REQUEST TO SEND
8 RECEIVE TIMING
9 CLEAR TO SEND
10
11 DATA MODE
12 TERMINAL READY
13 RECEIVER READY
14
15
16
17 TERMINAL TIMING
18
19 SIGNAL GROUND