Rockwell-automation 2711 MODBUS COMMUNICATIONS FOR PANELVIEW TERMINALS Uživatelský manuál stáhnout pdf (Strana 10)

Publication 2711-6.9 - March 2000

10 Modbus Communications for PanelView Terminals

Port/Modem Handshake [F5]

Steps through the available options:

• MODEM

• RS-232

• RS-422

• RS-485

Note: The following delays (RTS TX, RTS Off, and CTS Timeout)

facilitate modem communications. Refer to your modem user manual

for information on the recommended delay values.

RTS TX Delay (ms) [F6]

Opens the numeric entry scratchpad. Provide a delay value of 0 to

2000 milliseconds. The RTS TX delay specifies the delay between the

assertion of the RTS signal and the transmission of the first character

of the Modbus message.

RTS Off Delay (ms) [F7]

Opens the numeric entry scratchpad. Provide a delay value of 0 to

2000 milliseconds. The RTS Off delay specifies the delay between the

transmission of the last character of the Modbus message and the

assertion of the RTS signal.

CTS Timeout (ms) [F8]

Opens the numeric entry scratchpad. Provide a timeout between 0 to

2000 milliseconds. The CTS timeout specifies the maximum allowable

delay between the assertion of the RTS signal by the PanelView

terminal and the assertion of the CTS signal by the modem.

Exit [F10] or [F16]

Returns to the Configuration Mode menu.

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Rockwell-automation 2711 MODBUS COMMUNICATIONS FOR PANELVIEW TERMINALS Uživatelský manuál Strana 10