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Serial Communication
The Model 2850 is equipped with an RS-485 serial interface port which allows the analyzer to be controlled remotely
by a computer and makes networking up to 32 analyzers possible. AMETALK™, a software package developed
specifically for use with AMETEK Controllers, is now available. Please contact the nearest regional sales office for
more information about AMETALK™.
Hardware Requirements
An RS-485 to RS-232 converter is required to use serial communication. AMETEK RS-
485/RS-232 adapter part number 265858005 includes a special circuit which disables the
transmitter when the analyzer is idle, a necessity for two wire networks. This special
adapter also requires a line power supply, P/N 265858007 (120V, only) or 269128002 (230 V,
universal).
!
WARNING
Wiring Configuration & Baud Rate
Network configuration may be two or four wire mode at 300 to 9600 baud rate; refer to
Figures 11a and 11b for wiring diagrams. The controller CPU board is factory configured
for four wire mode; all dip switches on S1 are in the up position (on). To change to two
wire operation, some dip switches on S1 should be changed to the down position (off) as
shown on Figure 11b. Switch S1 is located on the main CPU board and is accessible by
removing the instrument cover.
When configuring the analyzer software for serial communication, the system value for
RS485_Baud must also take the wiring into account. Refer to the following table for cor-
rect baud rate values. Refer also to Part IV: Serial for more information on setting and
changing system values.
NOTES
2850 Moisture Analyzer
SERIAL COMMUNICATION
The RS232 to RS485 Adaptor and power supply (if provided) are not proven to be
suitable for use in explosive atmospheres. They must be located in a safe area. Any
cabling, to or from the Adaptor, that passes into a potentially explosive area must be
treated as incendive, and protected by metallic conduit or other means, consistent with
local electrical codes for hazardous locations.
System must be reset after changing baud rate. Reset by cycling power or running the
Watchdog Test (Chapter 7).
RS485_Baud Values
6-1
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