Appendix B. Standard S-Registers
S0 - Auto-Answer Ring Count
This register, when set to a number greater than zero, will enable support for answering incoming connections on the TCP port specified by the S1008 register. When an incoming connection is received, COM/IP will output a single RING message, followed by a CONNECT message. COM/IP will switch to online mode and the COM port will be connected to the remote host.
S2 - Escape Sequence Character
This register will hold the ASCII value of the escape character. The escape sequence will be a period of silence, as defined in S12, followed by three escape characters, followed by another period of silence. This will cause COM/IP to switch from online mode to command mode while a connection is open.
The default is 43 (the + character).
S3 - Carriage Return Character
This register will hold the ASCII value of the carriage return. The default is 13.
S4 - Line Feed Character
This register will hold the ASCII value of the line feed. The default is 10.
S5 - Backspace Character
This register will hold the ASCII value of the backspace. The default is 8.
S12 - Escape Sequence Guard Time
This register will hold the value of the silence period required when issuing an escape sequence, in 1/50th of a second increments. The default value is 50 (1 second).
S95 - Negotiation Progress Messages
This register, when set to anything other than zero, will override the W setting regarding how COM/IP reports connection progress. The default is 0.
Setting bit 2 of the register will enable the CARRIER message.
Setting bit 3 of the register will enable the PROTOCOL message.
Setting bit 5 of the register will enable the COMPRESSION message.
S100 - RING Message Interval
This register will specify (in 1/10th second units) the interval between RING messages issued to the application when a connection is received. After nine RING messages, COM/IP will stop and close the incoming connection.
The default value is 29 (2.9 seconds).