GE P485 instruction manual Bits Name Description, Code Name Description

ADVANCED FUNCTIONS

CONTROL CODES

STATUS REGISTER (P485 TO FIELDBUS CONTROL SYSTEM)

Bits	Name	Description
15	Handshake Confirmation	When the Profibus control system has read the new
	Bit (CR_HS_CONFIRM)	information from the status register, it should set this
		bit to the same value as bit 15 in the status register
14	Handshake Toggle Bit	The fieldbus (Profibus) control system should toggle
	(CR_HS_SEND)	this bit when new information has been written in the
		control register.
13	Data Valid (CR_DV)	This bit is used to indicate to the P485 if the data in
		the output data area is valid or not . The bit shall be
		set by the fieldbus control system when new data
		has been written (1 indicates data is valid; 0 indicates
		that data is NOT valid)
12 to 8	Control Code (CR_EC)	See table below.
7 to 0	Data (CR_ED)	See table below.

The following control codes are recognized by the P485 and can be used by the fieldbus control system.

Code	Name	Description
0x10	DISABLE_NODE	Slave address of the node to disable. This instructs the P485
		to disable a specific node from the sub network
		communication
0x11	ENABLE_NODE	Slave address of the node number to enable. This instructs
		the P485 to enable a specific node to be active in the sub
		network communication
0x12	ENABLE_NODES	Number of nodes to enable. This instructs the P485 to enable
		a number of nodes from a complete configuration

The status codes below are handled by the P485 and reported to the fieldbus control system using the status code and data bits in the status register. The meaning of these bits are different depending on the used communication model.

			Byte 0 (Offset 0x200)									Byte 1 (Offset 0x201)
15	14		13	12	11	10	9		8	7	6	5	4	3	2	1	0
-		-	-		Status Code								Data
Bits		Name						Description
15		Handshake Toggle Bit						The P485 toggles this bit when new information is
		(SR_HS_SEND)						available in the status register.
14		Handshake Confirmation						When the P485 has read the new information from
		Bit (SR_HS_CONFIRM)						the control register, it sets this bit to the same value
								as bit 14 in the control register
13		Data Valid (SR_DV)						Indicates to the fieldbus control system if the data in
								the input data area is valid or not . The bit is set by the
								P485 when new data has been written (1 indicates
								data is valid; 0 indicates that data is NOT valid).
12 to 8		Status Code (SR_EC)						Status code, see table below.
7 to 0		Data (SR_ED)						Status user data, see table below.

8–2 P485 MODBUS TO PROFIBUS CONVERTER – USER GUIDE