Signals:
The Osciloscope is a Tektronix MSO4054 (Mixed Signal, 500MHz, 4 channel scope) with the capabilities to decode the serial stream. Cyan trace is +", the Blue trace is "-", and the violet is the scopes decode of the serial stream. At the lower left are several "automatic" measurements made on the signal.
I have noticed that the signal levels appear pretty low. The two devices are connected via 2 wire, and a ground so this is in Half Duplex mode.
I will add an caption to each showing what the sent signal should have been....
RS485 Communicatoin between a Pelco-D camera and Poisidon
DVR Controller
STX
|
ID
|
Data1
|
Data 2
|
Data 3
|
Data 4
|
ETX
|
(XOR)
|
|||
Sig #
|
Description
|
Byte 1
|
Byte 2
|
Byte 3
|
Byte 4
|
Byte 5
|
Byte 6
|
Byte 7
|
Byte 8
|
Comment ?
|
1
|
Default?
|
A0
|
01
|
00
|
07
|
00
|
02
|
AF
|
0B
|
|
2
|
Tilt UP
|
A0
|
01
|
00
|
08
|
00
|
15
|
AF
|
13
|
Tilt Up, Tilt Speed 15
|
3
|
Tilt Down
|
A0
|
01
|
00
|
10
|
00
|
00
|
AF
|
0B
|
Tilt Down;
|
4
|
Pan Right
|
A0
|
01
|
00
|
02
|
15
|
00
|
AF
|
19
|
Pan Right,Pan Speed 15
|
5
|
Pan Left
|
A0
|
01
|
00
|
04
|
00
|
00
|
AF
|
0A
|
Pan-Left
|
6
|
Speed Low
|
A0
|
01
|
00
|
07
|
00
|
02
|
AF
|
0B
|
Iris Open, Focus Near, Focus Far, Tilt Speed 02
|
7
|
Speed Hi
|
A0
|
01
|
00
|
07
|
00
|
01
|
AF
|
08
|
Iris Open, Focus Near, Focus Far, Tilt Speed 01
|
8
|
Zoom +
|
A0
|
01
|
00
|
20
|
00
|
00
|
AF
|
2E
|
Zoom Tele
|
9
|
Zoom -
|
A0
|
01
|
00
|
40
|
00
|
00
|
AF
|
4E
|
Zoom Wide
|
10
|
Focus +
|
A0
|
01
|
01
|
00
|
00
|
00
|
AF
|
OE
|
Focus Far
|
11
|
Focus -
|
A0
|
01
|
02
|
00
|
00
|
00
|
AF
|
OC
|
Focus Near
|
12
|
Iris +
|
A0
|
01
|
04
|
00
|
00
|
00
|
AF
|
OA
|
Iris Open
|
13
|
Iris -
|
A0
|
01
|
08
|
00
|
00
|
00
|
AF
|
06
|
Iris Close
|
14
|
Goto Pos 5
|
A0
|
01
|
00
|
00
|
00
|
05
|
AF
|
0C
|
Tilt Speed 05
|
15
|
Goto Pos 2
|
A0
|
01
|
00
|
07
|
00
|
02
|
AF
|
00
|
Iris Open, Focus Near, Focus Far, Tilt Speed 02
|
16
|
Cruize
|
A0
|
01
|
00
|
07
|
00
|
02
|
AF
|
OB
|
Iris Open, Focus Near, Focus Far, Tilt Speed 02
|
17
|
Pan Top-Rgt
|
FF
|
03
|
00
|
OA
|
15
|
15
|
37
|
00
|
What happened Here????
|
Setup: PTZ, Pelco-P,
ID=1; Serial Rate: 9600,8,N,1;
|
||||||||||
First Byte for Pelco-P is always AO, 2nd byte is address 01
|
||||||||||
