User's Manual

9 Interfaces in detail DynaGATE 10-12 User manual Rev. 2-1
9.5 COM 0 and COM 1
The DynaGATE 10-12 provides the following COM ports:
l 1x RS-422/485: COM 0; Surge protected, Insulated, Full Duplex/Half Duplex
(Default: RS-485 Full Duplex)
l 1x RS-232/485: COM 1; Surge protected, RS-485 termination and fail-safe resistors
(Default: RS-232)
COMports specifications:
l The COM ports are surge protected
l Both COM ports are disabled when the DynaGATE 10-12 is initially powered ON
l Maximum supported baud rates are:
o
For RS-232 mode: up to 450 kbps
o
For RS-485 mode: up to 1.75 Mbps
The COM connectors are available on the front side.
For more information see:"How to manage the COM ports" on page75.
9.5.1 Note for termination resistors for COM 0 in RS-485 mode
The termination resistors can be driven using the "gpio_utility".
For more information see: "How to drive the GPIOs: the GPIO Utility" on page69.
9.5.2 Note for termination resistors for COM 1 in RS-485 mode
COM 1 has 2 pairs of pins (each signal is doubled):
l If the DynaGATE 10-12 is located at the beginning, or at the end, of a RS-485 chain, spare pair of
pins can be used to connect permanently standard axial resistor 120 Ohm, if the application
requires that
l If the DynaGATE 10-12 is not at the beginning or at end of the RS-485 chain, two options are
available:
o
Option 1: one pair of pins can remain not connected
o
Option 2: one pair of pins can be used to connect the previous device of the chain,
and the other pair can be used to connect the following device of the chain
9.5.3 Note for fail-safe resistors for COM 0 in RS-485 mode
Fail-safe resistors (1.21 kΩ) are already inserted by default and cannot be removed by the user.
54 / 114