ISO 8583 · Data fields

Field 22Point of service Entry Mode

pyiso8583 starter profilesIndependent explanation

What this field describes

This three byte container is labelled Point of service entry mode. It is distinct from the point of service condition and capture fields.

The library does not define all entry mode combinations. Use the network profile to interpret how card information was entered.

Compare the two profiles

Container settings from the pinned pyiso8583 source.
Settingdefaultdefault_ascii
Value encodingASCIIASCII
Length limitExactly 3 bytesExactly 3 bytes
PrefixNoneNone

Length limits describe encoded values. They exclude any length prefix. The profiles can be customized; these settings do not establish the required fields or accepted values for a live connection.

Read the field boundary

Field 223 bytesASCII value

Read exactly 3 value bytes. The next field begins immediately afterwards under this profile; no length prefix belongs to this field.

Find it in the bitmap

Bitmap
Primary
Position
22
Byte
3
Bit in byte
6

Positions start at one. Bits are counted from the most significant bit of each bitmap byte. This calculation locates the field’s presence indicator, not its value.