Nikon DTM Series Руководство по интерфейсу связи - Страница 5
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Nikon Communication Interface Manual
4. Electrical Characteristics
a) Synchronous Method
b) Communication Method : Full Duplex
c) Signal logic
d) Signal level
d) Baud rate
e) Stop bit
f) Data length
g) Parity
5. Nikon Communication commands
5-1. Protocol
"Protocol" is a set of rules applied to the communication in order to receive/send data securely.
It is independent from contents of receiving/sending data.
<Basic Protocol>
+0
+1
SOH
Sender
(01h)
code
Header
Code
- SOH (01h): Header; Start of the communication
- Sender/Receiver codes:
Ex.) When sending data from an external device to the instrument, the code
becomes 'CT'. If outputting data from instrument to an external device, it is
'TC'.
- Contents:
<Command/Data Protocol>
SOH
Sender
code
(01h)
STX (02h): Start of the command or data string
ETX (03h): End of the command or data string
* ASCII characters should be used in "Command/Data string"
<Control-code (ACK/NAK) Protocol>
SOH
Sender
(01h)
code
ACK = 06h: Permission of communication or success in transmission.
NAK = 15h: Failure in transmission (= request for re-send)
* ACK/NAK control-code doesn't need STX and ETX.
: ASYNC
: Negative True (1: ≦0.8V, 0: 2.4V≧)
: ±9V, standard
: 1200/2400/4800/9600/19200/38400
: 1 or 2 bit
: 7 or 8 bit
: None/even/odd
+2
+3
Receiver
STX
Command or
code
(02h)
data character
Contents
T: Instrument (Total Station)
R: Data Recorder
C: Other external device
Receiver
STX
Command/
Data string
code
(02h)
Receiver
ACK or
code
NAK
P5/34
---
+n
+n+1
ETX
BCC
(03h)
Chk
ETX
EOT
BCC
(03h)
(04h)
EOT
CR
BCC
(04h)
(0dh)
Confidential
+n+2
+n+3
+n+4
EOT
CR
LF
(04h)
(0dh)
(0ah)
Trailer
CR
LF
(0dh)
(0ah)
LF
(0ah)