Black Box IC483A-R2, Customer Support Information

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10
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). To connect signal ground to frame ground, install a
100-ohm,
1
⁄
2
-watt resistor at location RX near the P1 power connector on the board.
Figure 4-1. V.35 Interface.
Figure 4-2. RS-422 Interface.
CHASSIS GROUND
REQUEST TO SEND
DATA SET READY
DATA TERMINAL READY
TEST MODE
TRANSMITTED DATA
TRANSMITTED DATA
TERMINAL TIMING
TERMINAL TIMING
TRANSMIT TIMING
TRANSMIT TIMING
A
C
E
H
K
P
S
U
W
Y
AA
B
D
F
J
L
R
T
V
X
BB REMOTE LOOPBACK
RECEIVED DATA
RECEIVED DATA
RECEIVE TIMING
RECEIVE TIMING
SIGNAL GROUND
CLEAR TO SEND
RECEIVE LINE SIGNAL DETECT
LOCAL LOOPBACK
TEST PATTERN
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
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