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Keyword 2000 to RS-
232 Gateway
01/20/04 Page 5 of 20
3 RS-232 Setup
The gateway uses the following RS-232 parameters:
- 8 Data Bits
- 1 Stop Bit
- No Parity
The gateway supported baud rate: 57600.
Baud Rate
57600
The supported baud rate is sufficient for communicating with the Class2, Keyword, ACP, BEAN, and slower CAN
bus’s. However, USB connection is recommended for high speed CAN communications.
3.1 Buffering and Flow Control
Whenever the gateway receives a new message from the host, it will set the CTS line until the message can be
processed. The host should not send data to the gateway while the CTS line is set. Due to the speed of the
gateway processor, it is unlikely that the host will ever see the CTS line set.
The gateway buffers 64 bytes to send to the host. The gateway polls the RS-232 transmitter in the main loop to
send data to the host. In some cases, the RS-232 transmit buffer will overflow. This should occur only when
receiving CAN or IIC messages at a very fast rate. This will cause an ERc_RSFull error to be generated and the
data to be lost