Xantrex RS232-XPD Manuel d'utilisateur télécharger pdf (Page 23)

Installation and Configuration

Communications

Release 1.2 21

Once flow control is selected as option, two flow control methods are available. You

can use the rear panel XON switch to select either software-based XON/XOFF flow

protocol or hardware-based CTS/RTS or DTR/DSR flow protocol. Table 2.4 shows

the flow control conditions with regards to the markings on the rear panel subplate.

For a diagram of the rear panel subplate, see Figure 2.2, on page 17.

Table 2.4 Hardware/Software Flow Control Selection

Software

Flow Control

This software protocol uses special characters that synchronize device

communications. The device sends the control code XOFF (ASCII value 13 hex)

when it is not ready to receive data. The device sends the control code XON (ASCII

value 11) when it is ready to resume receiving data.

To choose XON/XOFF protocol, select the XON switch position shown in

Table 2.4.

Hardware

Flow Control

Hardware flow control protocol requires a dedicated control line on the RS-232

cable. The dedicated control line is needed so that the device can signal the controller

when it is ready to receive data. You can designate either RTS/CTS or DTR/DSR

protocol for the RS-232 interface.

Set the XON switch for hardware control using the information in Table 2.4. With

hardware flow control selected, RS-232 Interface PCB jumpers J16 and J17 dictate

the type of flow protocol. Table 2.5, “Jumper/Pin Settings for RTS/CTS Flow

Control (Default)” and Table 2.6, “Jumper/Pin Settings for DTR/DSR Flow Control

(Default)” identify jumper connections and input and output pin designations for

each protocol. See also “Transmit / Receive Pin Selection” on page 22 for RS-232

connector pinouts.

Note:When resetting the flow control switches during a working session, turn the

power supply OFF and then ON again to ensure that the new settings are put into

effect.

Table 2.5 Jumper/Pin Settings for RTS/CTS Flow Control (Default)

XON Switch Setting Condition

Hardware Flow Control

(CTS/RTS or DTR/DSR protocol)

Software Flow Control

(XON/XOFF protocol)

Jumper Connections RS-232 Connector Pin

RTS (Input to RS-232)

J17 to 2-4 and 3-5

CTS (Output to RS-232)

J16 to 1-3 and 4-6

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 59 60

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Xantrex RS232-XPD Manuel d'utilisateur Page 23

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