Mercury 2+ Operator Terminal User Manual
Page 73 of 82
2019r0
Appendix G
The Mercury 2+ Modbus interface will work in the following
manner:
•
The Mercury 2+ Modbus Terminal will be the Modbus slave
device.
•
The Mercury 2+ Modbus Terminal will respond in Modbus
RTU mode only.
•
The Mercury 2+ Modbus Terminal will respond only to a
fairly basic set of commands, such as those that a PLC
operating as a Modbus master may produce.
•
Complex commands, such as graphics etc. will be preloaded
into the Mercury 2+ Terminal whilst in ANSI (VT100) mode
and stored as messages in the NonVolatile memory, and
simply recalled when in Modbus mode.
Screen Control Registers
Register 1 : Display Mode
A single Modbus register will be allocated to set the character and
graphics screen modes and interactions.
0
Neither screen visible
1
Text on, Graphics off (Same coding as in ANSI Mode)
2
Graphics on, Text off
3
Text and Graphics on, screens logically ORed
4
Text and Graphics on, screens logically ANDed
5
Text and Graphics on, screens logically XORed
Register 2 : Set Keyboard Mode
1
Uppercase
2
Lowercase
3
Numerical
Register 3 : Reserved
Register 4 : Set Card Reader Mode
1
One shot mode
2
Disabled
3
Enabled
Screen Control Coils
1...99 Recall the stored message
100
Clear Screen
101
Cursor On/Off
102
Cursor Up
103
Cursor Down
104
Cursor Left
105
Cursor Right
Modbus Operation
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