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參數(shù)資料
| 型號： | PCSER4 |
| 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)： | 9/16頁 |
| 文件大小： | 285K |
| 代理商： | PCSER4 |
2192-09375-000-000
J228 PCSER4
Synchronous Clocks RS232/422 and 485 Switching and Receiver Disabling
There are four groups of nine pins: each group is a three-pin, two-position link. They are called
LK14A-C, LK24A-C, LK34A-C and LK44A-C. The first digit of the link number refers to the
channel; the letter refers to the function.
The 'A' links control receiver enables. If a link is inserted in position A on one of these links, the
receive buffer is enabled when RTS is active. If the jumper is in position B, the receive buffer is
permanently enabled.
The 'B' links change the function of the wires 3, 13, 23, 33 of the ribbon cable. In position A they
connect the wires to the RS485 transmitted data; in position B they connect the wires to the
85230 TRXC clock inputs via RS232 buffers.
The 'C' links change the function of the wires 5, 15, 25, 35 of the ribbon cable. In position A they
connect the wires to the RS485 received data; in position B they connect the wires to the 8530
TRXC clock inputs via RS232 buffers.
IMPORTANT: These signals are at TTL levels, not RS232 or RS422/485. Connecting RS232
or RS422/485 to these pins with a link inserted, will destroy the SCC.
Page 9
LK14A
Rx buffer enabled when RTS active
A
LK14A
Rx buffer is permanently enabled
B
LK14B
Pin 3 of PL2 connects to RS485 Tx data
A
LK14B
Pin 3 of PL2 connects to 85230 TRXC clock inputs via RS232 buffers
B
LK14C
Pin 5 of PL2 connects to RS485 Rx data
A
LK14C
Pin 5 of PL2 connects to 85230 RTXC clock inputs via RS232 buffers
B
LK24A
Rx buffer enabled when RTS active
A
LK24A
Rx buffer is permanently enabled
B
LK24B
Pin 13 of PL2 connects to RS485 Tx data
A
LK24B
Pin 13 of PL2 connects to 8530 TRXC clock inputs via RS232 buffers
B
LK24C
Pin 15 of PL2 connects to RS485 Rx data
A
LK24C
Pin 15 of PL2 connects to 85230 RTXC clock inputs via RS232 buffers
B
LK34A
Rx buffer enabled when RTS active
A
LK34A
Rx buffer is permanently enabled
B
LK34B
Pin 23 of PL2 connects to RS485 Tx data
A
LK34B
Pin 23 of PL2 connects to 85230 TRXC clock inputs via RS232 buffers
B
LK34C
Pin 25 of PL2 connects to RS485 Rx data
A
LK34C
Pin 25 of PL2 connects to 85230 RTXC clock inputs via RS232 buffers
B
LK44A
Rx buffer enabled when RTS active
A
LK44A
Rx buffer is permanently enabled
B
LK44B
Pin 33 of PL2 connects to RS485 Tx data
A
LK44B
Pin 33 of PL2 connects to 85230 TRXC clock inputs via RS232 buffers
B
LK44C
Pin 35 of PL2 connects to RS485 Rx data
A
LK44C
Pin 35 of PL2 connects to 85230 RTXC clock inputs via RS232 buffers
B
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