SDISC Assembler Call - NetEx

The conversion options are selected in the NRBDMODE field. The automatic datamode has the followingformat in the NRBDMODE field:’0’ The automatic datamode indicator “0” is in the high order bit.Source Character SetThese bits identify the conversion option (from 2) of the data used in the write buffer of thetransmitter.’0’ The high bit of the low order byte is reserved.Destination Character SetThese bits identify the conversion option (from 2) of the data going to the destination program.For example, a conversion from EBCDIC (3) to ASCII (2) would be entered as thehexadecimal value of 0302 or decimal value of 770.Auto Datamode Character SetsIndicatorConversion Option0 Bitstream mode1 Octet Mode2 ASCII (8-bit)3 EBCDIC4 Reserved5 BCD (Honeywell)6 Field-data (UNISYS)7 Displaycode (CDC)The processing rules for automatic datamode are listed below:• The transmitting driver examines the source character set specified. The character set implicitly specifiesthe method used to represent those characters on the transmitting machine. The driver selects an A/Dmode so those characters will be sent over the network as an 8-bit quantity. If the code conversion memoryis installed, the transmitting driver will select a code conversion function to hardware convert thecharacter set before the information is sent over the network. If code conversion is used, the transmittingdriver sets source character set to the value of the destination character set in the datamode field of theoutgoing message proper.• The receiving driver always reads a message proper in “octet” mode. By examining the datamode fieldand determining that character data is being sent, it selects an A/D mode to convert the 8-bit quantitiescoming over the network to the bit configuration used by the destination character set. If code conversionhardware is installed and the source character set does not equal the destination character set in the messageproper, then the data is code converted on input. Following such conversion the source character setfield in datamode is set to the destination character set value before the datamode is passed up to the receivingcaller.MAN-REF-H307IP-04 NETEX Request Block Page 31