Rev. A07
PayLink-IP/232 Configuration Guide
Page 11 of 26
Figure 8: Pass through message format
DP3000
Data is sent as raw packets with a user-defined 4-byte header. Each byte is entered as a two-character hexadeci-
mal value. The default header setting is 00 00 00 00. Data is passed through the PayLink-IP/232 to the server with-
out framing or parsing. In DP3000 mode, data is sent when the maximum packet size is reached or when the inter-
character delay limit is exceeded.
Figure 9: DP3000 message format
Merchant Link
Data is sent as packets with a header containing a user-defined element, the Gateway Message Format. The
default Gateway Message Format used is VISA-II; other formats can be entered as character strings.
Visa 1/2 standard framing
Standard-mode Visa 1/2 frames packets with STX, ETX, and LRC framing elements as shown below:
Figure 10: VISA 1/2 standard framing
Visa 1/2 transparent framing
Transparent-mode Visa 1/2 frames packets with DLE, STX, DLE, ETX, CRC1, and CRC2 framing elements as shown
below:
Figure 11: VISA 1/2 transparent framing
Length prefix framing
Includes a 2-byte header that indicates the total length of the data frame that follows, in Most Significant Bit, Least
Significant Bit order. An ETX (End of TeXt) character can be optionally appended by checking the “Append ETX”
checkbox.
Figure 12: Length prefix framing
First Data framing
Framing to suit the First Data Merchant Services protocol. Includes a 2-byte header that indicates the total length
of the data in the frame that follows, in Most Significant Bit, Least Significant Bit order. Data is also framed with
Start of TeXt and End of TeXt characters, and a Longitudinal Redundancy Check checksum is appended.