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SIGNATURE
B
US
P
ROTOCOL
M
ASTER
D
OCUMENT
Revised 2-24-98
Page 18 of 20
S
OFTWARE
R
EVISION
L
EVEL
R
EQUEST
C
OMMAND
:
R
ESPONSE
:
DB-25
DCE
DB-9
1
AA x
Protective Ground
2
TXD
3
BA I
Transmitted Data
3
RXD
2
BB O
Received Data
4
RTS
7
CA I
Request To Send
5
CTS
8
CB O
Clear To Send
6
DSR
6
CC O
Data Set Ready
Source
Device Type
Target
Device Type
Target
Unit ID
Source
Unit ID
Command
Modifier
Data
Length
Preamble
Byte
Command
Byte
Data
Byte(s)
Checksum
Byte
30
h
20
h
01
h
01
h
01
h
Computed
7E
h
77
h
None
See page 7
Source
Device Type
Target
Device Type
Target
Unit ID
Source
Unit ID
Command
Modifier
Data
Length
Preamble
Byte
Command
Byte
Data
Byte(s)
Checksum
Byte
20
h
30
h
01
h
01
h
02
h
Computed
7E
h
77
h
See below See page 7
The Software Revision Level Request command causes the target unit to transmit, in the
response, the revision level of its software. The response is a data word organized as
follows:
MSB Major revision level
LSB
Minor revision level
Example: 0205
h
would be software version 2.5