Open collector output settings (continued)Table 1-5:
Settings Description
Pulse output Pulse
width
Unless otherwise stated, pulses are 50% duty cycle for required frequency.
A pulse rate retransmit output generates 100 to 130 μs pulses at the falling
edge of every input pulse.
Pulse output maxi-
mum frequency
5 kHz, pulse width at 50% duty cycle.
If the programming of the outputs would exceed 5 kHz, the meter dis-
playsPULSE OVERRNG
Quadrature output Output set to quadrature lags the other pulse output by 90° (1/4 duty cycle)
at output frequency. Minimum 1 Hz
Timer output Programmable on and off time, repeating cycle. Minimum period 0.1 sec-
ond, maximum 100,000 seconds. Minimum pulse time 0.01 second, maxi-
mum 10,000 seconds.
1.7 Serial communication settings
The settings below are serial communication specifications for the Internal Display. Except
when noted, all specifications apply to operation at +25°C (+77°F).
Serial communication settingsTable 1-6:
Settings Description
Protocol 2-Wire RS-485 Modbus
®
RTU
Meter address/slave
ID
1 - 247
Baud rate 1,200; 4,800; 9,600; 19,200; 38,400; 57,600; or 115,200 bps
Transmit time delay Programmable between 0 and 199 ms
Parity/Stop it Even, odd, none with 1 stop bit, or none with 2 stop bits
Byte-to-byte timeout Max of 1.5 character times or 750 μs
Note: Refer to Modbus Register Tables at www.predig.com for details.
1.8 Default settings for startup of Internal Display
Internal Display factory settings are shown in the table below.
Default settings for startupTable 1-7:
Parameter Display Default setting
Input type INPUT Active
K - Factor units FUN IT Pulses/gallon
Introduction
10 LTM Internal Display
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