Q-See QC40198 - Manual (Page 30)

INSTALLATION & CONNECTION
QC40198 User Manual
21 | P a g e
Between contacts and
winding
1000VAC 1minute
Surge voltage
Between contacts with same
polarity
1500V (10×160us)
Length of open
time 3ms max
Length of close
time 3ms max
Longevity Mechanical 50×106 times (3Hz)
Electrical 200×103 times (0.5Hz)
Temperature -40°C ~+70°C (-40°F to +158°F)
3.8 RS232
You can connect the combo DVR with POS or Keyboard through RS232.
With POS system, the combo DVR can communicate through RS232 and network. For the POS system, the combo
DVR can integrate the text content and even search the record through the info.
The combo DVR also supports NKB operation. You can operate the combo DVR from keyboard controls instead of
using the control pad on the front panel of the unit.
3.9 RS485
When the combo DVR receives a camera control command, it transmits that command up the cable to the PTZ
camera. RS485 is a single-direction protocol; the PTZ device can’t return any data to the unit. To enable the
operation, connect the data cable from the PTZ camera to the RS485 (A, B) input on the combo DVR. See Figure 3-
9.
Since RS485 is disabled by default for each camera, you must enable the PTZ settings first. This combo DVR
supports multiple protocols such as Pelco-D, Pelco-P, as well as most common protocols (26 total).
To connect PTZ cameras to the DVR:
1. Connect RS485 A, B on the DVR rear panel.
2. Connect the other end of the cable to the proper pins in the connector on the camera.
3. Please follow the instructions to configure a camera to enable each PTZ device on the combo DVR.