jamesetherton99

Well, I did speak to the tech. staff of this camera wholesaler (shoppingcctv.com) and was told that they had an upgrade to all 1/3" CCD's. They then corrected the specs. on the website and list these two cameras as both being 1/3" CCD's and both as being 540 TVL cameras. However, they "effective pixels" are still higher on one camera. I tried to google the exact meaning of "effective pixels" and couldn't really get a satisfactory definition (not being a CCTV camera expert).

Can somebody please tell me if the "effective pixel" spec. is something to take into consideration and if I should buy the camera with the most effective pixels, all other specs. being the same?

i asked the staff about this, but they really couldn't tell me, saying instead that they "upgraded the CCD's and made the changes" on their website.

Thanks.

How is it possible for the ¼” CCD to have more “effective pixels” than the larger 1/3” CCD camera. Here are the two cameras I am looking at:

Camera Specifications Model GW648W

Image Sensor 1/3" SONY CCD

Effective Pixel NTSC: 768(H)x494(V)

Sensor area 4.9mm x 3.7mm

Horizontal Resolution 540TV Lines

Minimum Illumination 0.0 Lux (IR LED ON)

Electronic shutter Auto: 1/50(1/60) ~ 1/100,000Sec

S/N Ratio >48dB

Gamma 0.45

Lens 3.6mm

Video Output 1. 0Vp - p, 75Ω

IR wave length 850nm

Power supply DC12V±10%

Power consumption IR Distance

20M (65.6 ft with 24 Unit infrared LED)

Camera Specifications Model GW648

Image Sensor 1/4" SONY CCD

Effective Pixel NTSC: 811(H)x508(V)

Horizontal Resolution 540TV Lines

S/N Ratio >48dB

Clock Frequency (MHz) NTSC: 19.0699

Scanning System 2:1 Interlace

Minimum Illumination 0.0 Lux (IR LED ON)

Synchronous System Internal, Negative sync.

Auto Electronic Shutter NTSC: 1/60s~1/100,000s

Gamma 0.45

IR Distance 20M (65.6 ft with 24 Unit infrared LED)

IR Status Under 10 Lux by CDS

IR Power On CDS Auto Control

Video Output

1. 0Vp - p, 75Ω

Auto Gain Control Auto

Power/Current DC12V±10%/500mA

Lens 3.6mm

Dimension (mm) 126x69x67

Weight (g) 700

Storage Temperature -30 ~ +60˚C

Operating Temperature -10 ~ +45˚C

Also, I notice that when I research the 1/3" CCD camera above, that I get conflicting TVL's on a different website. It tells me 480TVL. Now I am really confused. What's the deal with a particular camera's specs. giving two different TVL specs? Am I being lied to?

Thanks.

use RS 485A and RS 485B only for PTZ

well....duh...yeah. I assume you mean the negative and positive control wires? I know that. My question is, how do i connect the two wires to pins 1 and 14 (R485_A, R485_B) of the male rs232c interface sticking out of my dvr. it does NOT have the "normal" (light green) interface. I since have got an answer from Raymond at Zmodo. He says just to attach the wires to the pins. I think I will see if a one pin header can be modified. I think that there *may* be enough room between pins for the small adapter. Maybe even a 1 pin header like from a pc fan? But I don't know if that's too small. I have forgotten so much of this IT, I need to go back and look again.

Thanks for the info. tho.

James

Hello. Can someone please tell me how I would connect a ptz camera to my dvr. I Notice that is does not have a "normal" RS485 interface, but rather a db25 male connection. Would I need some kind of converter or should I just go straight into pins 1 and 14 of the rs232C male interface? (pinout data below). This dvr is an Icatch rebranded.

Here are the pinouts, from the manual:

>

>

>

> DB 25 definition

>

>

>

> 1 RS485_B

>

> 2 RLY1_COM

>

> 3 GND

>

> 4 ALARMN2

>

> 5 ALARMN4

>

> 6 ARARMN6

>

> 7 ALARMN8

>

> 8 GND

>

> 9

>

> 10

>

> 11

>

> 12

>

> 13

>

> 14 RS485_A

>

> 15 RLY1-NO

>

> 16 RLY1_NC

>

> 17 ALARMN1

>

> 18 ALARMN3

>

> 19 ALARMN5

>

> 20 ALARMN7

>

> 21

>

> 22

>

> 23

>

> 24

>

> 25

>

thanks.

James