Chapter Nine: RS-232 Communications
General Information
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Chapter Nine: RS-232 Communications
General Information
The 146 unit is programmed to communicate with any host computer equipped with an RS-232
serial port, and an RS-232 cable. The 146 instrument is configured as a DTE (Data Terminal
Equipment) device, and uses a 9-pin male Type “D” IBM AT
®
configuration connector. All
standard baud rates are accepted up to a baud rate of 9600. The 146 unit supports 7 or 8 bit data
format, and any parity option (even, odd, or no). Commands sent via the RS-232 port allow full
control of all 146 functions remotely. The parameters, and inquiries of parameters and readings,
are both changeable.
RS-232 Communication Parameters
Parameter
Initial Setting
Options
Baud Rate
9600
300, 1200, 2400, 4800
Parity
Even
Odd, No
Number of Data Bits
7
8
Number of Stop Bits
1
Cannot be changed
End-of-Line Delimiter
CR
Cannot be changed
Protocol
MKS
Data Logger
Table 53: RS-232 Communication Parameters
Refer to Code 5: How To Configure the RS-232 Port, in Chapter Seven: Operation in Setup
Mode, for instructions on changing the communication parameters.
Note
The communication parameters cannot be changed on a displayless 146
unit.
How To Establish RS-232 Communications
Use the RS-232 connector on the rear panel to connect the 146 unit to your computer. Be sure to
use the correct RS-232 cable.
Displayless units have an RS-232 connector on both the front and rear panels. Note that the
RS-232 cable used for rear panel communications (refer to Table 32, page 77, for the proper
MKS part number) is not the same as the RS-232 cable used for the front panel (MKS p/n
CB146-21).
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