Epson XDT ユーザーズマニュアル
XDT User’s Manual Appendices
52
Appendix K: RS-232C Interface Protocol
The instrument uses a simple protocol to communicate to a host computer through its RS-232C
interface, see section 3.3.2.5 for electrical connections. The interface is configured as 9600 baud,
Even Parity, 8 Bits, 1 Stop; and it echoes all received characters.
To illustrate the protocol, the following notation conventions are used in this section:
The characters sent or received are depicted in bold. Send refers to sending from the host com-
puter to the XDT. Receive refers to receiving from the XDT into the host computer. The com-
mands and arguments are shown in capital letters while place holders for choices are labeled with
lowercase italic letters, with the allowed characters shown below, “nn” denotes a numeric value.
Bytes which are not characters are shown with diagonally placed mnemonics, for example Escape
interface, see section 3.3.2.5 for electrical connections. The interface is configured as 9600 baud,
Even Parity, 8 Bits, 1 Stop; and it echoes all received characters.
To illustrate the protocol, the following notation conventions are used in this section:
The characters sent or received are depicted in bold. Send refers to sending from the host com-
puter to the XDT. Receive refers to receiving from the XDT into the host computer. The com-
mands and arguments are shown in capital letters while place holders for choices are labeled with
lowercase italic letters, with the allowed characters shown below, “nn” denotes a numeric value.
Bytes which are not characters are shown with diagonally placed mnemonics, for example Escape
is depicted as
E
S
C
, this signifies a single byte (hex 1B). Optional characters or command argu-
ments are encompassed with brackets [ ].
The commands may be sent in either upper or lower case. Arguments may be delimited with
space or comma.
The commands may be sent in either upper or lower case. Arguments may be delimited with
space or comma.
HELP command
Lists all of the available commands.
Lists all of the available commands.
send: H[ELP]
C
R
receive: Help
?
Data
SN
C
R
L
F
Who
Reset Login
C
R
L
F
DATA command
Selects the reporting format of the current measurement.
This formatting will be retained until the next DATA command even if the power is turned off.
Selects the reporting format of the current measurement.
This formatting will be retained until the next DATA command even if the power is turned off.
send: DA[TA] units [interval [mode]]
C
R
C
nn
N
F
G
P
L
G
D
U
L
G
D
U
The units argument selects the units in which the measurement will be reported.
C,F,P,L & G select the dewpoint in °C,°F,ppm,Lbs H
2
0/mmscf and gm/m
3
respectively.
D selects decibels which is the measured sensor attenuation.
U selects using whatever units are selected by the user on the display.
U selects using whatever units are selected by the user on the display.
The interval argument is optional, if it is not entered then the measurement will be reported only
on a query with the “?” command. However if it is desired for the unit to report the measurement
on a regular interval without a query then an interval in seconds may be specified in the range 1 to
255 seconds. This feature allows the user to log the measurement on a dumb terminal or a printer.
on a query with the “?” command. However if it is desired for the unit to report the measurement
on a regular interval without a query then an interval in seconds may be specified in the range 1 to
255 seconds. This feature allows the user to log the measurement on a dumb terminal or a printer.