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Manual Documentation Number: RT-12 series-4006m 5
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104 – www.bb-elec.com
B&B Electronics – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445 – www.bb-europe.com
Modbus Functions Supported
01 Read Coil Status: Reads the ON/OFF status of discrete outputs (0X references,
coils) in the slave. Broadcast is not supported.
02 Read Input Status: Reads the ON/OFF status of discrete inputs (1X references) in
the slave. Broadcast is not supported.
03 Read Holding Registers: Reads the binary contents of holding registers (4X
references) in the slave. Broadcast is not supported.
04 Read Input Registers: Reads the binary contents of input registers (3X references)
in the slave. Broadcast is not supported.
05 Force Single Coil: Forces a single coil (0X reference) to either ON or OFF.
06 Preset Single Register: Presets a value into a single holding register (4X
reference).
15 (0F Hex) Force Multiple Coils: Forces each coil (0X reference) in a sequence of
coils to either ON or OFF.
16 (10 Hex) Preset Multiple Registers: Presets values into a sequence of holding
registers (4X references).
6 Manual Documentation Number: RT-12 series-4006m
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104 – www.bb-elec.com
B&B Electronics – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445 – www.bb-europe.com
Modbus Register Maps
RT12-4444 Modbus Map
Function 1
00001 Digital Input 1
00002 Digital Input 2
00003 Digital Input 3
00004 Digital Input 4
Function 2
10001 Digital Input 1
10002 Digital Input 2
10003 Digital Input 3
10004 Digital Input 4
Function 3 (Holding Reg)
40001 AO 1
40002 AO 2
40003 AO 3
40004 AO 4
40005 Freq Input 1
40006 Freq Input 2
40007 Totalize 1 Low
40008 Totalize 1 High
40009 Totalize 2 Low
40010 Totalize 2 High
40011 Time to Save Counter
Function 4 (Inputs)
30001 AI 1 12bit
30002 AI 2 12bit
30003 AI 3 12bit
30004 AI 4 12bit
30005 Vin 10bit
RT12-0044 Modbus Map
Function 1
00001 Digital Input 1
00002 Digital Input 2
00003 Digital Input 3
00004 Digital Input 4
Function 2
10001 Digital Input 1
10002 Digital Input 2
10003 Digital Input 3
10004 Digital Input 4
Function 3 (Holding Reg)
40001 FQ1 (Input-1)
40002 FQ2 (Input-2)
40003 Totalize 1 Low
40004 Totalize 1 High
40005 Totalize 2 Low
40006 Totalize 2 High
40007 Time To Save Counter
Function 4 (Inputs)
30001 Main Vin 10Bit
30002 Batt Vin 10Bit