Vicon video switcher – Ring Communications DNA200 User Manual
Page 20
DNA200 OPERATIONS MANUAL
20
2008/05/01
VICON VIDEO SWITCHER
This video switcher interface is used for systems with multiple Monitors and multiple Cameras.
The Masterstation/DAD104 with the video monitor must be configured in the DXC/DXA with the network address
for the Video Switcher. The DNA200 must then be configured for all intercom stations with camera and/or
monitor.
COMMUNICATION PROTOCOL
The device receiving from the DNA200 is setup in the following matter:
The interface is using RS232 between the baud rates of 1200-19200 bps (see S
ETTING
B
AUD
R
ATE
/D
EVICE
T
YPE
S
ELECT
earlier in this chapter).
Data bits, stop bits and parity is programmable (see Configuration),
Hardware flow control (RTS/CTS).
MESSAGE FORMAT
The message format is in the following sequence for the DNA200:
<SOH>A###<CR><LF>
From DNA200 (monitor select)
<SOH>$<CR>
To DNA200 (message accepted)
<SOH>B####<CR><LF>
From DNA200 (camera select)
<SOH>$<CR>
To DNA200 (message accepted)
<SOH>G##<CR><LF>
From DNA200 (camera preset)
<SOH>$<CR>
To DNA200 (message accepted)
SOH
Start-of-heading Control A (hex 01)
A
Monitor select command (hex 41)
B
Camera select command (hex 42)
G
Camera Preset command (hex 47)
##
Preset 2 digit numeric (01-99)
###
Monitor address 3 digit numeric
####
Camera address 4 digit numeric
$
Message accepted (hex 24)
?
Message error (hex 3F)
*
Message transmission error (hex 2A)
CR
Carrage return (hex 0D)
LF
Line Feed (hex 0A)
The DNA200 will retransmit a message if <SOH>?<CR> or <SOH>*<CR> is received instead of the expected
<SOH>$<CR>. If no response is received within 2.5 seconds the message is also retransmitted.
Maximum two retransmit for each message.