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Omega OMEGAETTE HHT=1501 User Manual

Page 18

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4. Protocol of RS-232C Serial Interface (RM-1501)

Ten bytes are sent out through RS-232C connector to PC. The definitions of
each byte are as followings:

Byte 1:

Leading byte 0x0D

Byte 2:

Decimal point of LCD display
bit0: dp1 (0000.0), if 1
bit1: dp2 (000.00), if 1
bit2: dp3 (00.000), if 1

Byte 3:

Flags for current status
bit0: low battery, if 1
bit1: Max. value overflow, if 1
bit2: Counter overflow, if 1
bit3: Auto-power-off disable, if 1
bit4: Min. value overflow, if 1
bit5: Ave. value overflow, if 1

Byte 4:

Unit
bit0: rpm, if 1
bit1: m/min, if 1
bit2: ft/min, if 1
bit3: yd/min, if 1
bit4: rps, if 1
bit5: counter with external light source, if 1
bit6: counter without external light source, if 1

Byte 5:

Function
bit0: normal, if 1
bit1: max, if 1
bit2: min, if 1
bit3: average, if 1

Byte 6:

Flags for current status
bit4: LCD reading over load (OL)
bit7: Hold

Byte 7:

Least significant byte of reading in binary format

Byte 8:

2nd byte of reading in binary format

Byte 9:

3rd byte of reading in binary format

Byte 10:

Most significant byte of reading in binary format

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