7I90HD 15
OPERATION
LBP16 HOST INTERFACE
GENERAL
The LBP16 serial host interface is a high speed (to 10 Mbits/sec) RS-422 host
interface suited to remote data acquisition and distributed I/O systems. Like the other host
interfaces the LBP16 allows all of the standard HostMot2 I/O modules to be used. LBP16
uses standard asynchronous communication.
CONNECTIONS
The RJ45 connector J1 is used for LBP16 serial communications. This connector
matches the pinout of MESAs 7I74 and 7I44 daughtercards for FPGA host interfaces, so
only a standard CAT5 cable is needed.
SETUP OPTIONS
The current LBP16 firmware has no EEPROM setup options but has 2 jumper
selectable options, Low_Baud and CRC_Disable. These options are intended to simplify
testing and allow 115200 baud rate for firmware updating via normal USB-serial adapters.
These options are selected by grounding pins on the EPP/SPI interface connector. This
can be accomplished easily by installing standard .1" shunts across pins on P4 since the
even numbered pins are grounded and the signal pins have pullup resistors.
HIGH (OPEN) LOW (SHORTED)
P4 pins 23,24 2.5 M Baud 115.2 K Baud
P4 pins 21,22 CRC enabled CRC disabled
Note that setting the low baud rate option sets the packet framing timeout to 25
character times instead of the normal 2 character times. This is to make access easier with
standard serial ports and USB/serial adapters.
PROTOCOL
For detailed information on the LBP16 serial protocol, see the reference section of
this manual
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