PILLAR CB6687-2L输入特性模件,CB6687-2L使用速度
除模式外，用户还必须知道波特率、奇偶校验和使用的停止位数由公用线路上的其他单位提供。所有这些参数都可以通过PLC软件进行更改配置
以下帧协议组合在HE693RTU900或在选择Modbus主帧协议时，应考虑HE693RTU940和。请参阅下面突出显示的段落。
配置“ASCII模式，1个停止位和无奇偶校验”实际上需要在RTU900将接受字符。配置“RTU模式，2个停止位，奇偶校验”实际上只会生成1个停止位，这可能会也可能不会影响应用程序对字符的接收。3.4握手
PILLAR CB6687-2L输入特性模件HE693RTU9x0提供五种不同的握手模式，以提供多点配置或限制返回到具有硬件/软件限制的主机的数据流。无-不提供握手。如果从设备以一定的速率和值返回数据
主机无法处理，数据将丢失。如果使用RS-485，则传输驱动程序将持续启用。
软件-RTU接口模块在接收XOFF时暂停发送数据性格此后，在接收到XON角色后，将继续传输。（此模式不应与RTU模式一起使用）。硬件-RTU接口持续向发送方断言。电流互感器在RTU传输。如果主机将CTS线路降到低位，RTU将暂停转让。此后，当主机提升CT时，传输将继续线
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
