Magtek MagneSafe V5, Reference Manual

Page: 41 / 138

Section 2. Communications
33
Example Set Max Packet Size property Response (Hex):
Result Code Data Len Data
00 00
Example Get
Max Packet Size property Request (Hex):
Cmd Num Data Len Prp ID
00 01 0A
Example Get
Max Packet Size property Response (Hex):
Result Code Data Len Prp Value
00 01 08
UART/RS-232 COMMUNICATIONS PROPERTY (UART/RS-232 READERS ONLY)
Property ID: 0x0A
Property Type: Byte
Length: 1 byte
Get Property: Yes
Set Property: Yes
Default Value: 0x02
Description: This property specifies the speed, stop bits, and parity for RS-232
Communications. The speed, stop bits, and parity are independently
selectable. Note that once this command is accepted and the reader is reset or
power cycled, the new communications parameters are in effect. An
application that wishes to communicate with the reader must use the correct
speed and parity. There is no method of bringing a reader to a “default” speed
and parity, thus the user that changes this must be aware of the settings, or
must discover the settings by sending repeated commands in the range of
possible settings (48 possible configurations). The number of data bits in each
character is dependent on the parity setting, see the table below.
Note that Mark parity (see below) can be interpreted two ways:
1. 7 bit characters, parity always equals 1, one stop bit, or
2. 7 bit characters, no parity, 2 stop bits.
The Stop Bits specification applies only to data transmitted from the reader; the
reader never requires more than one stop bit from the host but will function
normally if the host includes more than one stop bit.
The following table defines how to interpret the values this property may have.