Oem628 Com3 Multiplexed With Event2 And Usergpio - Novatel OEM6 Series User Manual

Installation OEM6 Family Cards
OEM628 RECEIVER
The OEM628 card, COM1 can be configured as either RS-232 (with hardware flow control, if the cable
used supports it) or RS-422 (with no hardware flow control), by setting main connector pin 2 LOW or
HIGH respectively.

By default, RS-232 is selected since the pin-2 input, if open, is pulled LOW by an internal
pull down resistor.
To select RS-422, apply 3.3 VDC to pin 2 during start-up. See Figure 61, Top-view, P1500 Main
Connector 24-Pin Header on Page 130 for pin-out details for COM1 RS-232 and RS-422 configurations.
A third serial port, COM3, is also available on pin 7 (RXD) and pin 19 (TXD). By default, COM3 is
enabled. COM3 is multiplexed with both EVENT2 and USER0.
To enable COM3:
1. If a user application is running, make sure it does not initialize GPIO_USER0.
2. Issue the following command: MARKCONTROL MARK2 DISABLE
3. Issue the following command: INTERFACEMODE COM3 NOVATEL NOVATEL ON
Use any interface mode except NONE
Refer to the OEM6 Family Firmware Reference Manual
information.
To enable MARK2:
Issue the following command:
1. MARKCONTROL MARK2 ENABLE
2. INTERFACEMODE COM3 NONE NONE OFF
Figure 13: OEM628 COM3 Multiplexed with EVENT2 and USERGPIO
OEM6 Family Installation and Operation User Manual Rev 7
RXD3
MUX
EVENT2
TXD3
MUX
USER0
(OM-20000129) for further command
P1500 Pin 7
P1500 Pin 19
Chapter 2
33