Multi-Tech Systems DT102/xx, DT101/xx owner manual Data Port Configuration, Menus

Chapter 6 - Menus

6.2.1Data Port Configuration

The Data Port Configuration menu allows you to configure the data channel for either asynchronous or synchronous operation, depending on the type of device connected to the channel. If the port is configured for synchronous operation, refer to Sync Data Port Configuration.

When the port is configured for asynchronous operation, options such as speed, flow control, and pacing may need to be changed. The following Data Port Configuration menu displays the default parameters for async mode of operation:

Data Port Configuration

1	-	Async/Sync:		Async
2	-	Speed:		19200
3	-	Word	Length:	8
4	-	Stop	Bits:	1
5	-	Parity:		None
6	-	Flow	Control:	CTS
7	-	Enq/Ack Flow Control:		Off
8	-	Echo:		Off
9	-	Pacing:		Off
10 - EIA Pass Through:				Off
11	-	Pass	Xon:	Off

S- Store All Configurations M - Main Menu

P - Previous Menu Selection : _

The Async/Sync option configures the port for either asynchronous or synchronous operation. When an asynchronous device such as a PC or a host computer is connected to the channel, the data port needs to be configured for asynchronous operation. The default for this option is Async.

The Speed option needs to be set when the async device is operating at a channel speed other than 19.2k. When the data channel is connected to an asynchronous device, the channel baud rate is from 300 bps to 115.2K bps. The default channel speed is 19.2k bps.

The Word Length option sets the number of bits in a word. The word length range is 5 to 8 bits. The default is 8 bits.

The Stop Bits option sets the number of stop bits. The number of stop bits is 1, 1.5, 2. The default is 1 bit.

The Parity option sets parity for odd, even or none. Under normal conditions, parity is set to none. The default is none.

The Flow Control option allows for two types of flow control: the software-based XON/XOFF and the hardware-based Clear to Send (CTS). The default condition is CTS. Flow control is the means by which data flow from the channel device into the DataTalker is controlled. Flow control is necessary when the data handling capacity of the data channel cannot keep up with the volume of data sent to it. When the channel device controls data flow to itself, it is called pacing (see Pacing option). The combination of flow control from the channel device and pacing to the channel device is how data transfers are regulated so that no data is lost.

DATATALKER-INITIATED

FLOW CONTROL

	DATA
Channel		DataTalker
Device

CHANNEL DEVICE-

INITIATED PACING

DATA

ChannelDataTalker Device

Flow control stops the input of data to the DataTalker

Pacing stops the output of data from the DataTalker

The Enq/Ack Flow Control option is a special flow control protocol used in Hewlett Packard computer systems. This option is sometimes referred to as Enquire/Acknowledge flow control because it’s based on the computer sending an enquiry (ENQ) and then expecting an acknowledgment (ACK). The default condition for this option is off.

67