NORRISEAL-WELLMARK
4
REVISION 2021-5-14
Serial Connections
Connecting to Serial Radios
If your device does not have specific inputs for 2-wire MODBUS RTU
communication, jumpering RTS/CTS and TXD/RXD pins to communicate may be
required. See your devices manual for details on connecting to RS485 enabled
devices.
Example wiring with a MDS-SD9 Serial Radio is shown below (using a DB9 MALE
to screw terminal adapter).
Critical Radio Network Settings
A standard network requires that these parameters are set the same on all
radios in the network.
•
Frequency Key*
•
Mininum Packet Size
•
Maximum Packet Size
•
Network ID**
•
RF Data Rate
*If using parallel repeaters, Frequency Key setting may differ between devices
**Call book may be used in place of Network ID, but the appropriate serial
number must be listed in the Call Book for each radio
Converting to RS232 Communication
The DigiUltra controller comes with MODBUS RTU communication via 2-wire
RS485.
Conversion to RS232 communication using a converter such as a DT-9000 is
shown below.
Note that if the RS232 device does not provide power, external DC power
source must be wired into the DB9 Female breakout board GND and VCC
connections. Example wiring:
