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| 型號： | PC-COM4 |
| 英文描述： | PC(ISA)BUS I/O CARD |
| 中文描述： | 電腦（ISA）總線的I / O卡 |
| 文件頁數(shù)： | 5/20頁 |
| 文件大小： | 492K |
| 代理商： | PC-COM4 |
Page 5
2192-09197-000-000
J606 PC-COM4
CONTROL SYSTEMS
LK19-22 Differential Pair Termination Links
Each differential Pair on Channels A and B can be terminated in six ways according to the
following table:
Note: Optical Isolation has been omitted from the above diagrams to aid clarity..
(Default link positions are marked +.)
The following links relate to the following differential pairs:
Link
Channel
LK19
B
LK20
B
LK21
A
LK22
A
LK23, 24 Channel B Mode Links
(Default positions marked with +).
Link Configuration
Circuit Configuration
Description
Unterminated
Line Driver connects directly to the
differential pair.
Terminated
Differential pair is terminated with
124R resistance between signal
lines.
Pulled Inactive
+
Differential pair is pulled apart to
mimic no character being transmitted
from the UART.
Pulled Inactive and Terminated
Differential pair is terminated with
124R and is pulled apart to mimic to
character being transmitted.
Pulled Active
Differential pair is pulled apart to
mimic a UART sending a break
condition.
Pulled Active and Terminated
Differential pair is terminated with
124R and is pulled apart to mimic a
break condition.
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
A
PIN
B
A
124R
4K7
4K7
PIN
B
A
4K7
4K7
PIN
B
A
124R
4K7
4K7
PIN
B
A
4K7
4K7
UART
PIN
B
A
124R
PIN
B
A
RS422 Pair
Transmit
Receive
Transmit
Receive
RS485 Pair
BI-directional
n/a
Bi-directional
n/a
Signal Names
B-TXBA, B-TXBB
B-RXA, B-RXB
A-TXBA, A-TXBB
A-RXA, A-RXB
LK23
A
B
B+
LK24
A
A
B+
Mode
Comment
RS422 Point-point
RS422 Multi-drop
RS485
Transmit on B-TXB, Receive on B-RX
Transmit on B-TXB, Receive on B-RX
Transmit and Receive on B-TXB
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