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17.15 REMOTE OPERATOR INTERFACE - The DE-2500 has a feature called the Remote
Operator Interface or “ROI” that can be accessed through function code 20. This feature
makes it possible for any function normally accessible locally on the keypad to be
implemented remotely via Modbus. Since the response to the Key Press commands
automatically returns the current display on the device, a possible conflict between local and
remote control authorities can be readily avoided and the actual device status on the display
is known at both locations.
Query:
NN 20 KP CRC CRC
Where: NN = node number, 20 = KP function code, KP is the single byte "Key Press" from
the table below, CRC CRC = two byte Modbus RTU CRC.
"Key Press" Table
00 = NONE ( no keypress, returns current display )
01 = CANCEL TIMERS
02 = TEST
03 = RESET
04 = STOP
05 = VIEW
06 = NEXT
07 = UP/UNITS
08 = VIEW CHAN
09 = F1
10 = RIGHT/TENS
11 = ENTER
12 = LEFT/TENS
13 = F2
14 = MENU
15 = DOWN/UNITS
16 = ESC
Response:
NN 20 88 (20 bytes 1st line of display) CR LF (20 bytes 2nd line) CR LF (20 bytes 3rd line)
CR LF (20 bytes 4th line) CR LF CRC CRC
NN = node number, 20 = KP function code, 88 = number of bytes to follow,
CR = Carriage Return, LF = Linefeed, 4 20 byte ASCII blocks that is the display, CRC CRC
= two byte Modbus RTU CRC
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