Chapter 4 ________________________________________________________________ Operation
VAISALA _______________________________________________________________________ 95
Example: use the command to activate and then release the relays.
>rtest on on
ON ON
>rtest off off
OFF OFF
>
Enter the command
RTEST
without parameters to stop testing.
Operation of RS-485 Module
RS-485 interface enables communication between RS-485 network and
the barometer. The RS-485 interface is isolated and offers a maximum
communications rate of 115 200 bits/s. (For maximum bus length of 1
km, use bit rate 19200 b/s or less.)
When selecting an RS-232-RS-485 converters for the network, avoid
self powered converters as they don't necessarily support the needed
power consumption.
Networking Commands
Set the RS-422/485 interface by using the following commands.
RS-485 configuration commands
SERI, ECHO, SMODE, ADDR
INTV
can be entered by using either the service port or the RS-422/485
port. Also the optional display/keypad can be used, see section
Port Serial Settings on page 81
SDELAY
With the
SDELAY
command you can set delay (response time) for the
user port (RS232 or RS485), or view currently set delay value. Value
corresponds to tens of milliseconds (for example, 5 = 0.050s minimum
answer delay). The value can be set between 0...254. Example:
>sdelay
Serial delay : 0 ? 10
>sdelay
Serial delay : 10 ?
NOTE
User port on the barometer main board cannot be used and connected
when RS-485 module is connected. Service port is operating normally.