Specifications

INSTALLATION & SETUP • CONNECTING EQUIPMENT
26
7 Beaver Brook Road, Littleton, MA 01460 • 978-486-0086 • www.burk.com
FOUR WIRE LEASED-LINE
MODEM CONFIGURATION
Program and configure your four-wire modem before you make
connections to your RF equipment.You need two four-wire
modems: one for your monitoring PC, and one for your site.
The VRC2500 software package currently supports three types of
4-wire modems: Motorola V.3400, MultiTech MT5600BL, and
MultiTech MT2834BL.
If you are using a different brand or model of modem, you may
need to modify the Set Auto Answer, Unset Auto Answer and
Initialization strings to match the VRC's requirements. The table
at right defines each of the commands used in these strings.
DIP Switches
You may also need to adjust the DIP switch settings. The table
below provides the DIP switch definitions required for the
MultiTech MT2834BL.
COMMAND DEFINITION
AT Required Command Prefix.
S0 Sets the number of rings in
Auto Answer Mode. When
set to 0, Auto Answer is OFF.
S0=1 Auto Answer after 1 ring.
S0=0 Auto Answer disabled.
&F Loads a generic template.
&F is the same as &F0.
E0 Sets local echo OFF.
&C1 Sets Carrier Detect (CD)
signal to normal operations.
&D1 Sets DTR operations. 14.4:
Reserved and 28.8:
reserved.
DIP SWITCH POSITION DEFINITION
1DOWNDTR (Data Terminal Ready)
forced ON at all times
2UP SDLC (Synchronous Data Link
Control) Mode ON
3UP Command Mode Response OFF
4UP AS/400 Mode OFF
5* UP Answer Mode ON (Transmitter)
DOWN Originate Mode ON (Studio)
6UP Slave Clocking OFF
7DOWNRTS (Request to Send signal
forced ON at all times
8DOWNCommand Mode ON
9DOWNRemote Digital Loopback ON
10 UP Lease Line Operation
11 DOWN Internal Clock Selected
12 DOWN Asynchronous Mode ON
13 DOWN 19,200 bps Operation
14 UP
15 UP CD/DSR (Carrier Detect/Data
Set Ready) from Interface
16 UP 2-Wire Leased Line
DOWN 4-Wire Leased Line
* Use appropriate setting for your installation.