Q.VITEC Imagechecker Q.400PD, Руководство по оборудованию

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3.3 Bottom view
23
3.3.1.1 RS422/RS485 serial interface
The optional RS422/485 serial interface is available as a Sub-D 9-pin connector (female) and is
mounted at optional interface 2. The interface can be configured via DIP switches (see tables).
RS485 mode communication can be either in full-duplex or half-duplex mode. While running in
RS485 half duplex mode, the system stays in receiver mode. Switching to transmission mode
occurs automatically and is triggered by the RTS line or the last sent message using the TxD
line, which the user defines.
 RTS : the RTS signal must be activated by the application software before starting the
data packet transmission The RTS signal has to be disabled again after data transmis-
sion has been terminated.
 TxD : the receiver device has to wait a certain time (timeout) before starting to send
any data.
Default DIP switch settings
DIP switch (SW1) settings. Factory settings are marked in gray.
Serial communication type
Switch from transmitting
to receiving mode
SW1 settings
DIP1 DIP2 DIP3
RS422 4-channel mode - OFF OFF OFF
RS485 4-wire mode (Bus Master) - ON OFF ON
RS485 2-wire mode RTS ON ON ON
RS485 2-wire mode Timeout ON ON OFF
Termination resistor for RS422 and RS485
SW1 settings
DIP4
Deactivated OFF
Activated ON
Timeout Min. baud rate
SW1 settings
DIP5 DIP6 DIP7 DIP8
10.2ms 1200 OFF OFF OFF OFF
9.6ms OFF OFF OFF ON
9.0ms OFF OFF ON OFF
8.4ms OFF OFF ON ON
7.8ms OFF ON OFF OFF
7.2ms OFF ON OFF ON
6.5ms OFF ON ON OFF
5.9ms OFF ON ON ON
4.8ms 2400 ON OFF OFF OFF
4.3ms ON OFF OFF ON