Rockwell-automation 2706-DXX Dataliner Message Display DL5 Series Uživatelský manuál stáhnout pdf (Strana 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

1 2 ... 43 44 45 46 47 48 49 50 51 52 53 ... 118 119

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Rockwell-automation 2706-DXX Dataliner Message Display DL5 Series Uživatelský manuál Strana 48