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聯系手機:
固定電話:
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郵編:361001
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廈門紀揚科技有限公司是一家以工業自動化為主營,融科、工、貿于一體,
專業從*工業自動化工程項目設計、安裝、調試等服務和*銷售各類進口**
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CME420-D-1; B73060001
4
3
1
2
6
7
8
9
J17 RS-232 RS-485 RS-422
TX/RX+ TX+
TX/RX- TXRX+
RXCom7
RI 8
DSR 8
RTS 8
RXD 8
CTS 8
TXD 8
DTR 8
RLSD 8
5
4
3
1
2
6
7
8
9
J18 RS-232 RS-485 RS-422
TX/RX+ TX+
TX/RX- TXRX+
RXCom8
Model 700 Gas Chromatograph System Reference Manual
APRIL 2012 3-9000-521
3 - 45
Figure 3-30. GC Phoenix Plug Port to External Modem DB 25-pin Port
3.4.5 Long distance connection (RS-422, RS-485)
RS-422 and RS-485 serial protocols are recommended for longer
distance serial connections between the PC and GC System (i.e.,
distances greater than the 50 feet).
To connect your PC to one of the internal Model 700 RS-422/RS-485
serial port jacks:
1. Obtain the following equipment:
? An asynchronous line driver (or interface device) with RS-232
input and RS-422/RS-485 output. See Appendix A for example
brand and model.
? Shielded, computer-grade, twisted pair cable (to connect the
asynchronous line driver device to the GC).
? A straight-through serial cable (to connect the PC to the line
driver).
2. Connect the straight-through serial cable from the PC serial port
to the RS-232 serial port of the line driver device. Then connect
System Reference Manual Model 700 Gas Chromatograph
3-9000-521 APRIL 2012
3 - 46
the twisted pair cable to the RS-422/RS-485 serial port of the line
driver.
3. Configure the line driver for data communications equipment
(DCE) operation. See Appendix A for an example configuration.
4. Access the GC FTB (see Figure 3-20 in "Section 3.4.2: Preparing for
serial connections").
5. Choose an available serial port on FTB that is configured for RS422 or RS-485 serial protocol, and connect the twisted pair cable
from the line driver. See Appendix A for example connection. Also
see Figure 3-24 through see Figure 3-28 for a list of ports and
terminals assigned for serial communications.
Note