Siemens Milltronics BW500/L - P774 Data Bits; P775 Stop Bits; P778 Modem Attached

Communications
11.3 Configuring Communication Ports
BW500 and BW500/L
Operating Instructions, 12/2016, A5E33482052-AD
129
11.3.5
P774 Data bits
The number of data bits per character for the selected port, ports 1 to 3 (P774-01 to –03).
Protocol
P744 Value
Modbus RTU
8
Modbus ASCII
7 or 8
Dolphin Plus
7 or 8
Note
If using port 2, 8 data bits must be used.
Values
5 to 8 ( f = 8)
11.3.6
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)
11.3.7
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 BW500 and BW500/L
does not automatically configure the modem.
Autobaud (enabled by P778=1)
When the BW500 and BW500/L 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 BW500 and BW500/L 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 BW500 and BW500/L. See your modem
documentation for information on fixing the baud rate.
Values
0 f no modem connected
1 modem connected