Xantrex Internal M9B-HFS Series, Техническое руководство

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INSPECTION AND CONFIGURATION M9B-HFS INTERFACE
2-4 Release 1.0 (97/10)
2.3 S1 Switch Communication Settings
2.3.1 Baud Rate Selection
Serial transmission sends and receives data in bit streams at fixed bit rates. Both the computer and the interface
must have the same bit rate setting for proper communication. Use switches B3, B2, and B1 on the rear panel S1
switch to select the power supply's rate of transmission in bits per second. Switch settings are summarized in
Table 2.3-1. Refer to Figure 2.2-2 for a drawing of the rear panel subplate.
Note: When resetting switches B3, B2, and B1 during a working session, turn the power supply OFF and then
ON again to ensure that the new settings are put into effect.
Switch OPEN=0 (OFF) Switch CLOSED=1 (ON)
Table 2.3-1 S1 Switch Settings for Baud Rate Selection
BAUD Rate B3 B2 B1
9600 1 1 1
4800 0 1 1
2400 1 0 1
1200 0 0 1
600 1 1 0
300 0 1 0
150 1 0 0
75 0 0 0
2.3.2 Flow Control
Flow control signals regulate data flow for proper communication. The M9B-HFS Interface card uses XON/XOFF
protocol to monitor and report on the status of the transmission between devices. You can select flow control
using the back panel S1 switch. Set the S1-FLOW switch to ON to invoke flow control. Set S1-FLOW to OFF to
disable flow control.
Table 2.3-2 S1 FLOW Switch Setting for Flow Control
S1-4 Setting Flow Control Setting
ON Software Flow Control enabled
OFF Flow Control disabled
XON/XOFF
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 hex) when it is ready to resume receiving data.