Serial Ports
The Hera 604 provides two configurable serial ports. Open Basic Settings > Serial Ports > Serial port 1 or Serial port 2 to match a port to the connected equipment.
Important: The serial mode, baud rate, data bits, parity, stop bits, and electrical controls must match the connected device and wiring. Incorrect electrical-mode or termination settings can prevent communication. Use the values specified in the equipment design or installation record.
Device
/dev/eser0 or /dev/eser1
Internal device assigned to serial port 1 or serial port 2.
Stop bits
1, 1.5, or 2
Number of stop bits used to mark the end of each transmitted character.
Data bits
5, 6, 7, or 8
Number of data bits in each character.
Parity
None, Even, Odd, Forced 0, or Forced 1
Parity method used for serial error checking.
Baud rate
9600
Communication speed in bits per second. Select the rate required by the connected device.
Timeout (seconds)
100
Time the router waits before treating an inactive serial operation as timed out.
Mode
RS232, RS422, or RS485
Electrical signalling standard used by the connected serial equipment.
Duplex
Half or Full
Determines whether the link transmits and receives alternately or at the same time.
Loop
Enabled or Disabled
Enables serial loopback behaviour. Use only for an approved test configuration.
EN_A
Enabled or Disabled
Hardware control for serial transceiver channel A. Use the value specified for the selected electrical mode and wiring.
EN_B
Enabled or Disabled
Hardware control for serial transceiver channel B. Use the value specified for the selected electrical mode and wiring.
A_DE
Enabled or Disabled
Driver-enable control for serial channel A. Use the value specified for the selected electrical mode and duplex arrangement.
Termination
Enabled or Disabled
Enables line termination where required by the RS422 or RS485 wiring design.
Termination TX
Enabled or Disabled
Enables transmit-side termination where required by the wiring design.
Select Save after configuring the port.
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