Pepper Computer RS485 User Manual
SMART I/O User’s Manual
©1996 PEP Modular Computers GmbH
March 12, 1996
Page 2 - 15
2
Chapter 2 SMART-BASE
2.5.5 RS232 Telephone Connector (BU1)
In order to meet the needs of widespread standards, the RS232 connector is
selected as a telephone connector, an 8-pin RJ12 telephone jack with full
MODEM support.
* optional, for full-duplex operation
2.5.6 RS485 D-Sub Connector (BU2) for Half-Duplex Operation (Profibus)
Pin Nr.
Signal
Description
Pin Nr.
Signal
Description
1
SHIELD
Shield Isolation
6
Aux. +5V Auxiliary +5V
2
N/C
Not Connected
7
N/C
Not Connected
3
T/RxD +
Transmit / Receive Line
8
T/RxD -
Transmit / Receive Line
4
CNTR +*
Control Line
9
CNTR -*
Control Line
5
Aux. GND Auxiliary Ground
1
5
6
9
1 2
8
Pin Nr.
Signal
Description
1
DSR
Data Set Ready
2
RTS
Ready to Send
3
System GND System GND
4
TxD
Transmit Line
5
RxD
Receive Line
6
DCD
Data Carrier Detect
7
CTS
Clear to Send
8
DTR
Data Terminal Ready