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2.2 Serial Port Programming - ASCII:
These commands require either the RS-232 (-S) or RS-485 (-M) hardware option. To use
the serial port programming commands, connect a computer terminal to the serial port cable. The
terminal must have the proper Comm port settings to communicate to the 1250-LTC (see Sections
3.3 and 3.4, pages 46 - 47). See Table 2.2 for a full listing of all Serial Programming Commands
and syntax. At the command prompt, type a command followed by the new parameter setting,
using proper syntax as shown in Table 2.2. Typing the command only, without a new para-
meter setting, will cause the 1250-LTC to transmit the present setting for that parameter.
Table 2.2 Serial Programming ASCII Commands:
◊=space ª=enter
Command Syntax: Function: Explanation:
SETUPª Enter the Setup Mode This command must be entered before
any other commands can be made.
EXITª Re-starts the serial connection Changes to comm. port settings will take
effect
RUNª Return to the Run Mode Changes to settings will take effect
DISPª Displays all setup parameters Each setup parameter command is dis-
played with the current value following it
DUMPª Displays all measured LTC
information
(See Figure 2.2, page 17)
Lists: Total tap change count, Days since
Pass-Through-Neutral, High & Low
Draghand positions, Change Up-To and
Down-To counts for each tap, Maximum
On-Tap deviations for each tap, etc…
POSª Displays present Tap #, synchro
position (in degrees) and current
On-Tap deviation degrees
Reads Tap #, 0.0 to 359.9 degrees, with
one decimal place of resolution
Press ª (enter) to exit
MODE◊nnª
Segmented modes See Section 2.4, page 34-37 for details
ACKRLY◊LOª
Selects which relay will assert
momentarily after each tap
change
Choose “OFF”, “LO” or “HI” relay to
assert momentarily after each tap change
ACKDLY◊nn.nª
Sets the delay time, in seconds,
before the ACK relay asserts
n= a number from 0.1 to 9.9 with one
decimal place resolution
ACKHOLD◊nn.nª
Sets the duration, in seconds,
that the ACK relay remains on
n= a number from 0.1 to 9.9 with one
decimal place resolution
DHCOUNT◊FIRSTª
Selects which visit to the
Draghand position to begins the
day counter
Choose “FIRST” or “LAST” visit.
The number of days since the LTC
visited that extreme position the first or
last time
DHLRST Low Draghand Reset Draghand value becomes present tap
DHHRST High Draghand Reset Draghand value becomes present tap
LTLMT◊nnª
Set Low Tap alarm limit n= an integer, any valid tap number
LTRLY◊LOª
Selects which relay is associated
with the Low Tap alarm
Choose “OFF”, “LO” or “HI” relay to
assert when the alarm limit is reached
LTCLRª Clears Low Tap Alarm Also resets “Days Since Alarm” counter
HTLMT◊nnª
Set High Tap alarm limit n= an integer, any valid tap number
HTRLY◊LOª
Selects which relay is associated
with the High Tap alarm
Choose “OFF”, “LO” or “HI” relay to
assert when the alarm limit is reached
HTCLRª Clears High Tap Alarm Also resets “Days Since Alarm” counter
TAPS◊nnª
Set number of taps n= an integer from 2 to 40
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