Laurel Electronics Modbus Protocol For Series 2 Laureate Digital Panel Meters, Counters, Timers & DIN-Rail Transmitters - Manual (Page 28)

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74 004A Serial
Config 2
Bits 4:0 Meter Serial Address (0-31) [Non-Modbus]
Hex 0 = Broadcast (01 = 1 to 0A = 10),
0F = 15, 10 = 16, 1F = 31
Bit 5 0 = Continuous Mode, 1 = Command Mode
Bit 6 0 = No Alarm data w/ readings, 1 = Alarm data
Bit 7 0 = No LF following CR, 1 = LF following CR
75 004B Serial
Config 3
Bits 2:0 Data sent in serial output
0 = All active Items, 1 = Item1, 2 = Item2,
3 = Item3, 4 = Peak, 5 = All active Items+
Peak, 6 = Valley, 7 = All active Items + Peak +
Valley
Bit 3 0 = Termination chars at end of all items
1 = Termination chars at end of each item
Bit 4 0 = Non-latching RTS
1 = Latching RTS
Bit 5 0 = * is Recognition Character
1 = Custom Recognition Character
Bit 6 0 = No Serial Start / Stop Characters
1 = Start / Stop Characters
Bit 7 0 = Full Duplex, 1 = Half Duplex
76 004C Serial
Config 4
Bits 1:0 00 = No Parity
01 = Odd Parity
11 = Even Parity
Bits 3:2 00 = Custom ASCII
01 = Modbus RTU,
10 = Modbus ASCII
Bits 5:4 Modbus ASCII Gap Timeout
00 = 1S, 01 = 3S, 10 = 5S, 11 = 10S
77 004D Config Bit 0 0 = VF Batch, Atot zero cutoff
1 = Allow negative values
Bit 1 0 = Calculate Rate value
1 = Calculate Square Root of Rate
Bits 3:2 00 = Basic Counter, 01 = Extended Counter
10 = Custom Curve #1
11=Custom Curve #2 (if V-to-F)
Bits 7:4 0 = Exponential Overload
1 = 999999 Overload
2 = One Right Hand Dummy Zero
3 = Two Right Hand Dummy Zeros
4 = Clock Time in Seconds
5 = Clock Time in HH.MM.SS Format
6 = Remote Display, HKL Command