Instruction Manual
MX2A Active Thermocouple Gauge
3
RS-485 Communications
This gauge communicates with the host computer through an RS-485 interface. Each communica-
tion correspondence consists of a command line sent by the host computer and a response from the
gauge.
To communicate with the MX2A via RS-485, the user must have an RS-485 capable device to send
commands to the MX2A. Each command must be preceded by a * and will be an S, R, W, RC, or WC.
See the Communications Specifications heading for information on what settings are necessary to
properly communicate with the MX2A.
3.1
Changing Communications Settings
The communication parameters, (baud rate, address, etc.), are changed through the local menu.
Please see the section in this manual entitled Explanation of Menu Items and Navigation for more
information on navigating and editing within the menu. Below are provided some specifics on the
RS-485 Communications of the MX2A.
3.2
Communications Specifications
Table 2: RS-485 Communication Specifications
Interface
RS-485 compatible
Data Transfer Method
Synchronous/half duplicate method
Baud Rate
1200/4800/9600/19200/38400
Default Data Format
1 start bit, 8 data bits, 0 parity bits, 1 stop bit
Error Detection
Parity bit
Parity Bit
None/even/odd
Stop Bit
1
Transfer Distance
Max 100 meters
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mx2a_im rev F
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