Vaisala HMDW110 - Manual (Page 24)

4
SERVICE PORT
Connecting to the Service Port
n
Computer with
o Windows operating system
o
Terminal application
o Free USB port
o
Driver for Vaisala USB cable installed
n
Vaisala USB cable for computer connection (219690)
OR
n
Vaisala MI70 Hand-Held Indicator
n MI70 connection cable (219980SP)
The RS-485 line of the service port is shared with the connection to RDP100
display panel; the M8 service port connector is just an additional connector for
easier access. You can use the service port for configuration, calibration, and
troubleshooting of the transmitter.
Before plugging in a connection cable to the service port, perform the following
steps:
1. Open the cover of the HMDW110 series transmitter.
2. If the terminal block for terminals 5 ... 8 is wired, pull it out. This disconnects
the transmitter from supply voltage and prevents possible equipment
damage that may be caused by ground loops. The locations of the terminal
blocks and the service port are shown in section Component Board on
page 11.
3. If the other terminal block is wired (terminals 1 ... 4), pull it out also. This
prevents the communication between the transmitter and RDP100 remote
display panel from interfering with your connection.
22
4 Service Port