Product Description
GN Series Hardware Manual
24
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 afterdata
transmission has been terminated.
• TxD: the receiver device has to wait a certain time (timeout) before starting to send
any data.
ON
ON
1 876543
2
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
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