UART0 Serial Port
J1 provides TTL 3.3V level RX an TX access to the serial port. Although there is some basic
ESD protection on these signals, you are required to ensure voltage-level protection on these
external signals.
RS-485 Serial Port
The serial port provided on J1 is typically to be used for integrating with your device’s controller
(such as a PTZ controller). J1 provides RS422/485 access to the device’s serial port; TTL levels
for this same serial port are accessible via UART0 pins (TX and RX) on connector J1.
To connect a serial controller to an ATOMAS-MINI using RS-422/485 4-wire configuration, use
the following steps:
1. Ensure proper connection between RS-422 4-wire or RS-485 4-wire serial equipment
and the ATOMAS-MINI, use the following scheme:
2. Select the desired operation mode (RS-422 4-wire or RS-485 4-wire) using the devices
web interface or external VMS interface.
Note: The RS485 pins on connector J1 are only active if the mode of the serial port is set
to RS422 or RS485 via the devices web interface. If the serial port is set to any oth-
er mode, the RS422/485 driver is disabled and the serial port can only be accessed
using TTL UART0 pins on connector J1.
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