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ZCOM Tables and Data Structures

Message Header

Chapter 3116

MTAGW1, MTAGW2 - Message tag words

These are application defined tag words that are passed unaltered

through the ZCOM subsystem with the message data. They are supplied

in the zsend and zcntl calls and returned in the zread call. When a

receive message is returned from a terminal, the tag words are set to

zero.

MZAUXL - Auxiliary ZCOM address

When using the multiplexed mode of operation through the logical

terminal table, this field stores the original source ZLU.

Message Request Header (zmrq_type)

The six-byte message request block may or may not be present,

depending on the message type and whether it is destined for a terminal.

For request types 1, 4, and 6, to a terminal, the request block will be

present; for request types 2 and 7 the request block will contain

meaningless data. More information on the contents of this block can be

found in the firmware reference manual. The Message Request Header is

always present. For message types 2, 3, 7, 10, 11, and 15, it contains

meaningless data. For types 4, 6, 12, and 14, it contains valid data.

MRQCODE - Terminal request code

Table 3-38 Message Request Header (zmrq_type)

Field Name Field Description Field Type

Size

(Bytes)

MRQCODE Request code uns.char 1

MRQTERM Terminal number uns.char 1

MRQSTAT Request status uns.char 1

MRQTAG Tag parameter uns.char 1

MRQLEN Data length uns.short 2

1 2 ... 111 112 113 114 115 116 117 118 119 120 121 ... 327 328

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HP Advanced Communications Controllers (ACC) Guia do Utilizador Página 116