PILLAR CB6687-2L輸入特性模件,CB6687-2L使用速度
除模式外，用戶還必須知道波特率、奇偶校驗和使用的停止位數(shù)由公用線路上的其他單位提供。所有這些參數(shù)都可以通過PLC軟件進(jìn)行更改配置
以下幀協(xié)議組合在HE693RTU900或在選擇Modbus主幀協(xié)議時，應(yīng)考慮HE693RTU940和。請參閱下面突出顯示的段落。
配置“ASCII模式，1個停止位和無奇偶校驗”實際上需要在RTU900將接受字符。配置“RTU模式，2個停止位，奇偶校驗”實際上只會生成1個停止位，這可能會也可能不會影響應(yīng)用程序?qū)ψ址慕邮铡?.4握手
PILLAR CB6687-2L輸入特性模件HE693RTU9x0提供五種不同的握手模式，以提供多點配置或限制返回到具有硬件/軟件限制的主機(jī)的數(shù)據(jù)流。無-不提供握手。如果從設(shè)備以一定的速率和值返回數(shù)據(jù)
主機(jī)無法處理，數(shù)據(jù)將丟失。如果使用RS-485，則傳輸驅(qū)動程序?qū)⒊掷m(xù)啟用。
軟件-RTU接口模塊在接收XOFF時暫停發(fā)送數(shù)據(jù)性格此后，在接收到XON角色后，將繼續(xù)傳輸。（此模式不應(yīng)與RTU模式一起使用）。硬件-RTU接口持續(xù)向發(fā)送方斷言。電流互感器在RTU傳輸。如果主機(jī)將CTS線路降到低位，RTU將暫停轉(zhuǎn)讓。此后，當(dāng)主機(jī)提升CT時，傳輸將繼續(xù)線
In addition to the mode, the user must also know the baud rate, parity and the number of stop bits used
by the other units on the common line. All these parameters are changeable with PLC software
configuration.
The following frame protocol combinations are not completely interchangeable on the HE693RTU900 or
HE693RTU940 and should be considered in selecting the Modbus master’s frame protocol. See the
highlighted paragraph below.
The configuration “ASCII mode, 1 Stop Bits and No Parity” will actually require 2 stop bits before the
RTU900 will accept characters. The configuration “RTU mode, 2 Stop Bits and either Even or Odd Parity”
will actually generate only 1 stop bit which may or may not affect the application’s reception of characters.
3.4
Handshaking
The HE693RTU9x0 provides five different handshaking modes to provide for multi-drop configurations or
to limit data flow back to masters with hardware/software limitations.
NONE -
No handshaking is provided. If the slave returns data at a rate and value the
master is unable to handle, data will be lost. If the RS-485 is used, the transmit
driver will be enabled continuously.
SOFTWARE -
The RTU Interface module suspends sending data on the reception of a XOFF
character. Transfer will thereafter continue on the reception of a XON character.
(This mode should not be used with RTU mode).
HARDWARE -
The RTU Interface asserts RTS continuously to sender. CTS is monitored during
RTU transmissions. If the master drops the CTS line low, the RTU will suspend
the transfer. Transfer will thereafter continue when the master raises the CTS
line
