B&B Electronics RT12-4444-9T-W20 manual Modbus Functions Supported, Modbus Register Maps

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).

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.comB&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		RT12-0044 Modbus Map
Function 1		Function 1
00001	Digital Input 1	00001	Digital Input 1
00002	Digital Input 2	00002	Digital Input 2
00003	Digital Input 3	00003	Digital Input 3
00004	Digital Input 4	00004	Digital Input 4
Function 2		Function 2
10001	Digital Input 1	10001	Digital Input 1
10002	Digital Input 2	10002	Digital Input 2
10003	Digital Input 3	10003	Digital Input 3
10004	Digital Input 4	10004	Digital Input 4
Function 3 (Holding Reg)		Function 3 (Holding Reg)
40001	AO 1	40001	FQ1 (Input-1)
40002	AO 2	40002	FQ2 (Input-2)
40003 AO 3		40003 Totalize 1 Low
40004	AO 4	40004 Totalize 1 High
40005	Freq Input 1	40005	Totalize 2 Low
40006	Freq Input 2	40006	Totalize 2 High
40007	Totalize 1 Low	40007 Time To Save Counter
40008	Totalize 1 High	Function 4 (Inputs)
40009	Totalize 2 Low
40010	Totalize 2 High	30001	Main Vin 10Bit
40011	Time to Save Counter	30002	Batt Vin 10Bit
Function 4 (Inputs)
30001	AI 1 12bit
30002	AI 2 12bit
30003	AI 3 12bit
30004	AI 4 12bit
30005	Vin 10bit

6Manual 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.comB&B Electronics – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445 – www.bb-europe.com