Rockwell Automation 2706-DXX Dataliner Message Display DL5 Series - Manual (Page 48)

2706-UM001A-US-P
6-2 Using the Serial Port
RS-232 Signals The DL5’s RS-232 port uses Transmit Data signal, Receive Data signal, and
Signal Common. The Clear To Send, Data Carrier Detect, and Data Set
Ready pins are tied high (+12V) by the DL5, allowing direct connection of
the DL5 to terminals or computers requiring a request to send signal. No
jumpers at the terminal or computer connector should be required.
Data Carrier Detect - Pin 1 Indicates that a continuous frequency
“capable of being modulated or impressed with a signal” is being received.
The DL5 sets this line high.
Transmit Data - Pin 2 Sends out the serialized data from the DL5 (e.g., the
serial data is on this pin).
Received Data - Pin 3 This signal also carries serial data. However, the
serialized data is sent from another device as input to the DL5.
Data Terminal Ready - Pin 4 Indicates the transmission device (terminal)
is connected, powered up, and ready to send data. The DL5 ignores this line.
Signal Common - Pin 5 The ground reference for all other signals.
Data Set Ready - Pin 6 Indicates that a communications device is
connected, powered up, and ready for data transmission. The DL5 sets this
line high.
Request to Send - Pin 7 Signal from the terminal device requesting the
communication device to send data. This typically turns on the data carrier.
The DL5 ignores this line.
Clear to Send - Pin 8 This signal indicates to the transmitting device that it
can start sending data. The DL5 sets this line high.
Ring Indicator - Pin 9 This signal indicates that each device is physically
connected to adjacent devices. The DL5 sets this line high.
Pin Number Signal Name (Signal Mnemonic) Signal Type
1 Data Carrier (DCD) Output
2 Transmit (TXD) Output
3 Receive Data (RXD) Input
4 Data Terminal Ready (DTR) Input
5 Signal Common (COM) --
6 Data Set Ready (DSR) Output
7 Request to Send (RTS) Input
8 Clear to Send (CTS) Output
9 Ring Indicator (RI) Output