325.6610.17 - 72 -
4. Acknowledge - This message signals the addressed instrument that its last
echoed change message was received correctly; the instrument performs the
change requested.
01111110 80
H
+ I.A.
6.4.1.2 Instrument to Host:
1. Response - This message furnishes the data requested by the interrogate com-
mand of the host. It is also used to echo back the previous change message of
the host
01111110 20
H
+ I.A. NUM LO ADD HI ADD Data 1 XXXXX Data N LRC
6.4.2 Transaction Examples
EXAMPLE A - The host requests 9 bytes of data beginning at hexadecimal memory address
1000H from the instrument at datalink address 03.
1. Host sends interrogate message.
01111110 11100011 00001001 000000000
SOH Cmd + I.A. NUM LO ADD
00010000 11111100
HI ADD LRC
2. Instrument sends response message.
01111110 00100011 00001001 00000000
SOH Cmd + I.A. NUM LO ADD
00010000 XXXXX XXXXX XXXXX YYYYYYYY
HI ADD Data 1………Data 9 LRC
EXAMPLE B - The host sends 2 bytes of new data, to be loaded into the instrument at
datalink address 03 beginning at hexadecimal memory address 1000H.
1. Host sends change message.
01111110 10100011 00000010 00000000
SOH Cmd + I.A. NUM LO ADD
00010000 00001000 00001100 11001001
HI ADD Data 1 Data 2 LRC
2. Instrument sends Response message.
01111110 00100011 00000010 00000000
SOH Cmd + I.A. NUM LO ADD
00010000 00001000 00001100 01001001
HI ADD Data 1 Data 2 LRC
3. Host sends acknowledge message.
01111110 10000011
SOH Cmd + I.A.
4. The instrument performs the change requested at the end of the current scan.
6.5 Mnemonic-to-Datapoint Cross Reference
Many of the mnemonic prompts are actually alphanumeric representations of datapoint parameters
that are used to configure instrument operation. There are six datapoint types which are briefly de
scribed in Table 6-3. In the data format description of the table, subscripts H and D are used to de
note hexadecimal and decimal numbers respectively.
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