User's Manual Part 2

138 OEMV Family Installation and Operation User Manual Rev 5B

Appendix A Technical Specifications

Electrical format LVTTL (requires external CAN transceiver)

Bit rates 500 kb/s maximum. CAN Bus throughput is determined by slowest

device on the bus.

Signals supported

CAN1 is on Pins 6 and 7. CAN2 is on Pins 8 and 20.

USB

Electrical format Conforms to USB 1.1

Bit rates 5 Mb/s maximum

Signals supported USB D (+) and USB D (-)

a. Baud rates higher than 115,200 bps are not supported by standard PC hardware. Special PC

hardware may be required for higher rates, including 230400 bps, 460800 bps, and 921600 bps.

b. Upon power-up, USB is enabled and COM3 is disabled by default. COM3_Tx and COM3_Rx

are multiplexed with USB D (+) and EVENT1, respectively.

c. The receiver cannot prevent the host system from enumerating USB while using COM3 on the

OEMV-1G. This is due to the plug-and-play nature of USB. Do not connect a USB cable while

using COM3.

d. Enable COM3 using the INTERFACEMODE command.

e. CAN1_RX and CAN1_TX are multiplexed with VARF and EVENT2, respectively. The default

behavior is that EVENT2 is active. For VARF, refer to the FREQUENCYOUT command.

f. CAN Bus behavior must be asserted through the NovAtel API software. See Section 3.3.3, CAN

Bus on Page 46 for further details.

g. See also Figure 50 on Page 141 and its table.