Pinout

Pin		Definition		Remarks
1	2	U_SBUS	U_SBUS	S-BusThe power supply USBUS is powered by the coupler and by the power supply Us of the EtherCAT coupler.
3	4	GND	GND
5	6	RX0+	TX1+
7	8	RX0-	TX1-
9	10	GND	GND
11	12	TX0+	RX1+
13	14	TX0-	RX1-
15	16	GND	GND
17	18	R3+	R1+	Signal
19	20	RL3+	RL1+
21	22	R3-	R1-
23	24	R4+	R2+
25	26	RL4+	RL2+
27	28	R4-	R2-
29	30	NC	NC
31	32	NC	NC
33	34	NC	NC	UpThe device has no upper contacts and is powered solely via USBUS.
35	36	NC	NC
37	38	NC	NC
39	40	SGND	SGND

Pin Definition

Definition	Description
U_SBUS	S-Bus power supply 3.3V
GND	S-Bus ground signal (Note: Never connect to 0V Up!)
RXn+	S-Bus receiving positive signal
RXn-	S-Bus receiving negative signal
TXn+	S-Bus transmitting positive signal
TXn-	S-Bus transmitting negative signal
R1+	Input R1+
RL1+	Input RL1+
R1-	Input R1-
R2+	Input R2+
RL2+	Input RL2+
R2-	Input R2-
R3+	Input R3+
RL3+	Input RL3+
R3-	Input R3-
R4+	Input R4+
RL4+	Input RL4+
R4-	Input R4-
NC	Not Connected
SGND	Shield layer grounding

PDO Parameter Description

Name	Parameters	Data type	Description
Status	Underrange	Bit	Data is below the measurement range
	Overrange	Bit	Data is over the limit
	Error	Bit	0: No error1: If data is invalid (over or below the measurement range)
	TxPDO State	Bit	Reserved parameter
	TxPDO Toggle	Bit	Reserved parameter
Value	/	INT	Input channel data

COE Parameter Description

COE parameters 0x8000~0x8030 are used for parameter settings of the RTD module. The parameters marked with yellow “ ” are reserved parameters and cannot be configured. Note: when n takes values from 0 to 3, it corresponds to channels 1 to 4 respectively.

0x80n0 RTD parameter settings
Index	Name	Meaning	Symbol	Default Value
80n0:01	Enable user scale	Enable user scaling	RW	0x00
80n0:02	Presentation	Reserved parameter	RW	0x00
80n0:05	Siemens bits	Reserved parameter	RW	0x00
80n0:0A	Enable user calibration	Reserved parameter	RW	0x00
80n0:0B	Enable vendor calibration	Reserved parameter	RW	0x01
80n0:11	User scale offset	User scaling offset	RW	0x0000
80n0:12	User scale gain	User scaling gain.The gain is expressed in fixed-point format with a factor of 216.Value 1 corresponds to 65535 (0x00010000).	RW	0x00010000
80n0:15	Filter settings	Reserved parameter	RW	0x0000
80n0:17	User calibration offset	Reserved parameter	RW	0x0000
80n0:18	User calibration gain	Reserved parameter	RW	0xFFFF
80n0:19	RTD element	RTD type:0：PT100（-200℃...850℃）2：PT1000（-200℃...850℃）	RW	0x0000
80n0:1A	Connection technology	Reserved parameter	RW	0x0000
80n0:1B	Wire calibration 1/32 Ohm	Reserved parameter	RW	0x0000

SC3274 | 4 Channel RTD Measurement Module