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Rosemount   2240S-P0840FNA0A2M-Q1

 
RS-232.
? Usually there are two external serial port jacks on a PC, 
located on the rear panel. Most often, they are either DB-9 or 
DB-25 male (see below).
Note
Model 700 software upgrades can be installed via any available 
communications port. 
Figure 3-19. Serial port jacks
? PC serial ports can be used by other peripheral equipment 
attached to the PC, such as a printer, mouse, or modem, etc. 
To determine which PC serial ports are already being used by 
other equipment and which port can be used for connecting 
to the GC, note existing serial connections, refer to your PC 
user manual, and use diagnostic software (such as Norton 
Utilities).
2. What serial ports are available at the GC? 
The Model 700 without the FID comes equipped with three serial 
ports (standard), unless the customer needs a LOI Interface 
connection, then only two com ports are standard. The 
installation of the optional Com4A board (with or without a LOI) 
brings the total number of available serial ports to six.
System Reference Manual Model 700 Gas Chromatograph
3-9000-521 APRIL 2012
3 - 36
When you select a serial port, consider these points:
? Com1 and Com2 from the WinSystems CPU board (J1) and 
Com4 from the WinSystems CPU board (J6) to Field 
Termination board (J5 and J7) (standard configuration)
? Com3 from WinSystems CPU board (J6) to the multifunction 
board 
? Com4 is reserved for the LOI (Local Operator Interface), if 
installed.
The Model 700 with the FID comes equipped with two serial ports 
(standard). The installation of the optional Com4A board bring 
the total number of available serial ports to six.
When you select a serial port, consider these points:
? Com1 and Com2 from the WinSystems CPU board (J1) to 
Field Termination board (J5 and J7) standard configuration
? Com3 from WinSystems CPU board (J6) to the multifunction 
board (J4)
? Com4 from the WinSystems board (J6) is connected to the 
FID/TCD Preamplifier board (J4)
For additional serial ports, the:
? Optional Com4A board may be installed at the factory. Com5 
through Com8 are fully available to the user and are factoryconfigured to RS-232 protocol. See Appendix A for additional 
options (RS-422/485).
? With the optional Com4A board installed, six Com ports are 
available to the user.
3. Is the connection to be made in a …
? Short distance between the PC and GC?
? With temporary or permanent cable connection?
See Section 3.4.3, FTB connection (RS-232).
4. Is the connection to be made with a …
? Short distance between the PC and GC?
? Permanent cable connection (see Section 3.4.4).
Model 700 Gas Chromatograph System Reference Manual
APRIL 2012 3-9000-521
3 - 37
5. Is the connection to be made with a …
? Long distance between the PC and GC?
? Permanent cable connection (see Section 3.4.5).
3.4.3 FTB connection (RS-232)
The easiest way to connect a PC to the GC is with an off-the-shelf, 
straight-through serial cable connected to the GC serial port DB 9-pin 
connector pre-wired on the FTB.
1. Obtain a straight-through serial cable with these specifications: