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PayLink-IP/232 Configuration Guide
Page 15 of 26
10. Appendix A: Message negotiation
“Send ENQ”, “Use SYN/SYN/SYN”, “Send ACK” all disabled
By default, the three settings covered under this topic (“Send ENQ to terminal to initiate transmission”, “Use SYN/
SYN/SYN preamble to establish connection”, and “Send ACK to terminal after each received message”) are dis-
abled. This means that by default the PayLink-IP/232 operates transparently, passing all negotiation messages
directly between the terminal and the payment server.
Figure 15: Default operation
“Send ENQ”, “Use SYN/SYN/SYN”, “Send ACK” all disabled