Laurel Electronics Modbus Protocol For Series 2 Laureate Digital Panel Meters, Counters, Timers & DIN-Rail Transmitters - Manual (Page 15)

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Column Number
FC Action
1 2 3 4 5 6 7 8 9 10 11 12 13
03
03 Request
Response :
: MA
MA FC
FC RA
NB RA
DD*
NR
DD*
NR
LRC
LRC
CR
CR
LF
LF
04
04 Request
Response :
: MA
MA FC
FC RA
NB RA
DD*
NR
DD*
NR
LRC
LRC
CR
CR
LF
LF
05
05 Request
Response :
: MA
MA FC
FC RA
RA RA
RA WW
WW WW
WW LRC
LRC CR
CR LF
LF
08
08 Request
Response :
: MA
MA FC
FC SF
SF SF
SF WW
DD*
WW
DD*
LRC
LRC CR
CR LF
LF
10
10 Request
Response :
: MA
MA FC
FC RA
RA RA
RA NR
NR NR
NR NB
LRC
DD*
CR
DD*
LF
LRC CR LF
Exception
Response : MA FC
+80
EC LRC CR LF
10. MESSAGE EXAMPLES FOR DEVICE ADDRESS = 01, NO PARITY
Modbus RTU Modbus ASCII
Example Action
Ser_4 = 010 Addr = 001 Ser_4 = 020 Addr = 001
Restart Com-
munications* Request
Response 010800010000B1CB
010800010000B1CB :010800010000F6crlf
:010800010000F6crlf
Meter Reset Request
Response 01050001FF00DDFA
None :01050001FF00FAcrlf
None
Digital Reading
= +25.18 Request
Response 01040003000281CB
010404000009D67C4A :010400030002F6crlf
:010404000009D618crlf
Write Setpoint
1 = +37.00 Request
Response 0110000100020400000E743624
0110000100021008 :0110000100020400000E7466crlf
:011000010002ECcrlf
Read Setpoint 1
= +37.00 Request
Response 01030001000295CB
01030400000E74FE74 :010300010002F9crlf
:01030400000E7476crlf
First send decimal point, address 0057 as 00 03. Send -12.34 to
Remote Display
**
Request
Response 01100069000204FFFFFB2EF6E5
01100069000291D4 :01100069000204FFFFFB2E59crlf
:01100069000284crlf
* Suggested as first message after power-up. If device is in Listen-Only mode, no response is
returned.
** 1234 decimal = 000004D2 hex. -1234 = FF FF FB 2E in 4-byte 2’s complement hex. Decimal point
is ignored.
RTU: Bolded last 4 characters indicate the CRC (added automatically by the device).
ASCII: Bolded last 2 characters indicate the LRC ((added automatically by the device).