B&С 361114

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B&С  361114

 
3. Carefully lift up the assembly and rotate so that the enclosure 
opening is accessible.
System Reference Manual Model 700 Gas Chromatograph
3-9000-521 APRIL 2012
3 - 32
Figure 3-16. Oven Mounting Bracket
4. Locate the multifunction board. It is mounted on a bracket 
towards the center of the upper enclosure. 
Figure 3-17. Multifunction Board Location
Mounting Bracket
Thumb Screw
Multifunction
Board
Model 700 Gas Chromatograph System Reference Manual
APRIL 2012 3-9000-521
3 - 33
5. On the multifunction board, locate the Modbus slave address 
(Com ID) DIP switch. It is labeled “S1” and mounted on the lower 
right corner of the board.
Figure 3-18. Dip Switch
6. Inspect or change the DIP switch as necessary, using the wiring 
diagram as a guide. See Table 3-1.
? Make settings on switch S1 located on the multifunction 
board.
? Switches “1” through “5” form a 5-bit binary number for 
setting the Modbus slave address (also known as Com ID or 
Device ID).
? Switch number “1” is the least significant bit, and switch 
number “5” is the most significant bit. Set these switches 
either ON or OFF.
? Switch “6” and “7” are spares and switch “8” is used to cold 
start the processor. See Table 3-2.
System Reference Manual Model 700 Gas Chromatograph
3-9000-521 APRIL 2012
3 - 34
Use the GC maintenance records to document any changes made to the 
switch settings. 
3.4.2 Preparing for serial connections
The method for operating a Model 700 system is from a connected 
personal computer (PC). The PC must be:
? Running MON2000 software (version 2.2 or later). See the MON2000
User Manual (P/N 3-9000-522) for more information.
? Connected to the Model 700 via a serial link.
This section addresses the basic ways to wire a serial connection 
between a PC and the GC system.
Before connecting a PC to the Model 700, determine the following:
Table 3-1. Modbus slave address (COM ID) dip switch settings
Com ID 1 2 3 4 5
1 ON OFF OFF OFF OFF
2 OFF ON OFF OFF OFF
3 ON ON OFF OFF OFF
4 OFF OFF ON OFF OFF
5 ON OFF ON OFF OFF
6 SPARE
7 SPARE
8 COLD START
Table 3-2. Switch positions for cold start
8
Normal (Run) OFF
Cold Start ON
Model 700 Gas Chromatograph System Reference Manual
APRIL 2012 3-9000-521
3 - 35
1. What serial ports are available at the PC? 
When you select one, consider these points:
? Standard PC serial ports are type