PERIPHERAL ERROR CODESSERIAL COMMUNICATIONS ERROR TESTFormat of code:LEVEL 1 DIAGNOSTICS ERROR RETURNSPERIPH:01:ww Date TimeEXP DATA :xxf OBS DATA: yyWhere, ww = Detail codexx = Optional expected datayy = Optional observed dataNOTE: EXP DATA and OBS DATA are in reference to theregisters in error. If a register is not inquestion these fields are not displayed.Detail Code:The detail code is a bit sensitive code. It isdisplayed on the CRT as a hex code with bit 7 asthe MSB and bit 0 as the LSB. An "x" representsthe ''Don't Care State". The detail codes are toc o nstruct the error code for all serialcommunication failures. Block 1 codes representfailures of the 8250 serial communications chipor the line drivers used to transmit or receivedata from the serial (RS 232) port: To form theerror code the detail codes for block 1diagnostics are logically "or" ed. Observe thatthe following bit designation is used.bits 0,1bits 2,3bits 4bits 5,6bits 7communications channel selectederror during transmit or receiveinternal/external loop back testcontrol/status errorstime out or receive data errorNOTE: See Figure 5-25 for s t a t u s / c o n t r o ldefinitions5-38
