Mx20 Basic Data Port Configuration; B Asic D Ata P Ort C Onfigurations - Garmin MX20 Installation Manual

2.5.1 MX20 Basic Data Port Configuration

The basic MX20 supports four ports on connector J1. Three of the ports are RS-232 and one is RS-422.
The usage of each port is assigned during the configuration procedure (see section 2.7). The diagram
below provides an example of a configuration for the data ports. Samples of typical wiring
configurations are shown in section 2.5.7.
The following table shows the suggested port usage, however note that the software must be configured
to match the installed MX20 wiring configuration. Note that only one traffic source may be connected
to the MX20 I/O at one time. Only one FIS source may be connected to the MX20 or MX20 I/O at one
time.
PORT 1 RS-232
PORT 2 RS-232
PORT 3 RS-232
PORT 4 RS-422
* A GX-series unit running software version 3.2 or higher and enabled for extended mode and a CNX-series
(or GNS 480) unit is capable of receiving altitude data from the altitude encoder and passing the data to the
MX20. This configuration opens up an MX20 port for other options. Only one NAV receiver (CNX-series,
GNS 480 with NAV receiver or SL30, but not both) may be connected to the MX20.
** If the MX20 is configured with an internal GPS engine (430-0270-0( )), Port 3 is not available for external
connections.
MX20 Installation Manual
Table 2-1. Preferred Basic Data Port Configurations
MX20 With GPS
GX50/60* or equivalent
Altitude Encoder* or option
Internal GPS**
Legacy UAT Data Link Radio,
GDL 90 UAT Data Link Radio,
or option
Figure 2-10. Preferred Data Port Description
560-1025-09 Rev E
MX20 Without GPS
GX50/60* or equivalent
Altitude encoder* or option
SL30, or option
GDL90, WX-500, or option
Installation
15