RS485

You can operate the RS845 communication in two variants:

Without diagnosis
With diagnosis of the transmit data

RS485: 2-wire connection in bus structure to RS485 device(s)

Bus structure, half duplex data transmission

RS485 1: — 2-wire connection in bus structure to RS485 device(s)

The following CoE objects must be set

Index	Name	Meaning		Data type	Flags	Setting
F800:01	Interface type Ch 1	0x00	RS232	BIT1	RW	0x01 (1_dec)
F800:01	Interface type Ch 1	0x01	RS485/422	BIT1	RW	0x01 (1_dec)

Index	Name	Meaning	Data type	Flags	Setting
8000:06	Enable half duplex	0_bin	Full duplex: transmitted data are monitored. The bit has no effect in RS232 and RS422 mode	BOOLEAN	RW	1_bin (default)
1_bin	Half duplex: The reception of the data transmitted by the box itself is suppressed

Index

Name

Meaning

Data type

Flags

Setting

8000:06

Enable half duplex

0_bin

Full duplex: transmitted data are monitored. The bit has no effect in RS232 and RS422 mode

BOOLEAN

1_bin

(default)

1_bin

Half duplex: The reception of the data transmitted by the box itself is suppressed

Index	Name	Meaning		Data type	Flags	Setting
8000:07	Enable point-to-point connection (RS422)	0_bin	The module is used in a bus structure in accordance with the RS485 standard.	BOOLEAN	RW	0_bin
8000:07	Enable point-to-point connection (RS422)	1_bin	The module is used for a point-to-point connection (RS422).	BOOLEAN	RW	0_bin

Deactivated receive driver

The receive driver is deactivated during the transmission procedure. The transmitted data are not monitored!

RS485: 2-wire connection with external bridge in bus structure to RS485 device(s)

Bus structure, half duplex data transmission with diagnosis of the transmitted data

The following CoE objects must be set

Index	Name	Meaning		Data type	Flags	Setting
F800:01	Interface type Ch 1	0x00	RS232	BIT1	RW	0x01 (1_dec)
F800:01	Interface type Ch 1	0x01	RS485/422	BIT1	RW	0x01 (1_dec)

Index	Name	Meaning		Data type	Flags	Setting
8000:06	Enable half duplex	0_bin	Full duplex: transmitted data are monitored. The bit has no effect in RS232 and RS422 mode	BOOLEAN	RW	0_bin
8000:06	Enable half duplex	1_bin	Half duplex: The reception of the data transmitted by the box itself is suppressed	BOOLEAN	RW	0_bin

Index	Name	Meaning		Data type	Flags	Setting
8000:07	Enable point-to-point connection (RS422)	0_bin	The module is used in a bus structure in accordance with the RS485 standard.	BOOLEAN	RW	0_bin
8000:07	Enable point-to-point connection (RS422)	1_bin	The module is used for a point-to-point connection (RS422).	BOOLEAN	RW	0_bin

Activated receive driver (from firmware version 03)

The receive driver remains activated during the transmission procedure. The transmitted data are monitored! A conditional diagnosis of the line is thus possible. If there is a discrepancy between the transmitted data and the monitored data, it may be assumed that a further receiver also cannot receive these data flawlessly. In this case, check the bus line!