7ML19985CN01 Milltronics SF 500 - INSTRUCTION MANUAL Page 73
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Communications
P774 Data bits
The number of data bits per character for the selected port, ports 1 to 3 (P774-01 to –03)
.
:
Values
5 to 8 (
f
= 8)
P775 Stop bits
The number of bits between the data bits for the selected port, ports 1 to 3
P775-01 to -03).
Values
1 or 2 (
f
= 1)
P778 Modem attached
Sets port 1 (P778-01) to use an external modem.
Any connected modem must be set up to auto-answer incoming calls. The SF 500 does
not automatically configure the modem.
Autobaud (enabled by P778=1)
When the SF 500 is powered up or the P779 Modem Inactivity Timeout expires three
carriage returns are sent to the modem to allow it to set its serial connection to P772
Baud Rate.
If a connection is made with the modem at a different baud rate the SF 500 will attempt to
use that rate instead of the P772 value. For troubleshooting purposes the baud rate on the
modem can be hard-coded to the rate set on the SF 500. See your modem documentation
for information on fixing the baud rate.
Values
Protocol P744 Value
Modbus RTU
8
Modbus ASCII
7 or 8
Dolphin Plus
7 or 8
Note: Use 8 data bits when using port 2.
0
f
no modem connected
1 modem connected
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