User's Manual

DynaGATE 10-12 User manual Rev. 2-1 9 Interfaces in detail
9.5.4 Note for fail-safe resistors for COM 1 in RS-485 mode
To insert the RS-485 fail-safe resistors, use the DIP switch available in the Service Panel.
9.5.4.1 Switches meaning
Default DIP switch configuration is OFF; this means no resistors inserted.
SW # Signal Description
1 RS232_RX/485_D+ Line ON: 4.7 kΩ pull-up resistor inserted on COM 1
2 RS232_TX/485_D- Line ON: 4.7 kΩ pull-down resistor inserted on COM 1
9.5.5 Note for RS-485 half duplex (only for COM 0 in RS-485 mode)
To set an RS-485 connection in Half Duplex, add the following external loop-back in the COM connector
(see "COM 0 and COM 1 connector specifications" on the next page): connect pin 1 to pin 4, and pin 2 to
pin 5.
Then: pins 1 and 4 are: D+ Line (A/Y); pins 2 and 5 are: D- Line (B/Z).
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