![Wieland ricos Manual Download Page 86](http://html1.mh-extra.com/html/wieland/ricos/ricos_manual_979648086.webp)
onlinecomponents.com
Basic principles, overview and ordering information
©
2002 Wieland Electric GmbH Version 2.4* (December 2002)
86
Part no. 05.591.3389.0 © 2002 Wieland Electric GmbH
2.21.3 Terminal assignment of
ricos
RS 232/485
Pin no.
Designation
Meaning
X 2.21
24 V (red)
Power supply 24 V DC
X 2.22
24 V (red)
Power supply 24 V DC
X.3.21
GND (blue)
Reference potential 0 V
X 3.22
GND (blue)
Reference potential 0 V
X 3.0 –
X 3.7
GND (blue)
Reference potential 0 V
X 4.21
PE (yellow)
Protective conductor / shield connection
X 4.22
PE (yellow)
Protective conductor / shield connection
X 4.0 –
X 4.7
PE (yellow)
Protective conductor / shield connection
X 2.0
TxD
Data transmission cable
X 2.1
RxD Data
receiving
cable
X 2.2
RTS
Data control signal “Request to send” (input signal)
X 2.3
CTS
Data control signal “Clear to send” (output signal)
X 2.4
GND
Reference potential RS 232
X 2.5
A
Differential bus signal A
X 2.6
B
Differential bus signal B
X 2.7
GND
Reference potential RS 232
2.21.3.1 Terminating
resistor
A terminating resistor of 120 ohm must be connected to terminate the RS 485
bus. The terminating resistor must then be connected by the user between A
(terminal X 2.5) and B (terminal X 2.6).
2.21.4 Data width of
ricos
RS 232/485
The
ricos
RS 232/485 module supports 10 bytes of input data and 10 bytes of
output data.
The transfer of the transmitting and receiving data is carried out in up to 8 output
bytes and 8 input bytes.
Two control bytes and two status bytes are used to control the data flow.
Requests are displayed by the toggling of a bit. The subsequent processing is
signalled by an assigned bit. It adopts the value of the request bit.
The input bytes EB0 to EB7 form the memory range for up to 8 characters which
have been received by the interface.
The characters that should be sent are transferred in the output bytes AB0 to AB7.