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©2013 Technical Marine Service, Inc. LC-100 V2.97
Appendix B
Modbus Register Values
Below is a map of the input/output registers and coils available in the LevelCom 100 for
Modbus communications.
Read functions:
30001 Level Level in 0.1 inches
30002 Specific Gravity Specific Gravity x 1000
30003 Volume (1) Volume is combined in registers 30003 & 30004 to form a long
integer. See note 1 below.
30004 Volume (2)
30006 Status Bits Status codes as bits. See note 2 below.
30007 Max Depth Programmed Max Depth in 0.1 inches
30008 HiHi Alarm HiHi alarm set point in 0.1 inches
30009 Hi Hi alarm set point in 0.1 inches
30010 Lo Lo alarm set point in 0.1 inches
30011 LoLo LoLo alarm set point in 0.1 inches
The above registers are mirrored in the following holding registers:
40001 Level Level in 0.1 inches
40002 Specific Gravity Specific Gravity x 1000
40003 Volume (1) Volume is combined in registers 30003 & 30004 to form a
long integer. See note 1 below.
40004 Volume (2)
40006 Status Bits Status codes as bits. See note 2 below.
40007 Max Depth Programmed Max Depth in 0.1 inches
40008 HiHi Alarm HiHi alarm set point in 0.1 inches
40009 Hi Hi alarm set point in 0.1 inches
40010 Lo Lo alarm set point in 0.1 inches
40011 LoLo LoLo alarm set point in 0.1 inches
The following coil bits signal various conditions in the LevelCom as noted:
10001 HiHi Alarm 1 = HiHi alarm activated
10002 Hi Alarm 1 = Hi alarm activated
10003 Lo Alarm 1 = Lo alarm activated
10004 LoLo 1 = LoLo alarm activated
10005 Big Number See note 1 below
10006 Loop failure 1 = 4-20 mA loop failure
10007 SG line over pressure 1 = SG sense line is over pressurized (plugged)
10008 DP line over pressure 1 = DP sense line is over pressurized (plugged)
10009 EPROM failure 1 = EPROM failure
10010 Sense line leak 1 = Main sense line is leaking
10011 Sense line over Pressure 1 = Main sense line is over pressurized (plugged)
10012 Check Air 1 = Low supply air pressure
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