VeriFone e355 User And Best Practices Manual page 27

Table 10 PMR-MUX2 Status Strings
Message Status String
<0xFF><0x5A>a<num><crc>
<0xFF><0x5A>n<num><code><crc>
Table 11 PMR-MUX2 Error Codes
Error
Code Name
Code
0x31 Channel not open
0x32 Invalid Channel Number
0x33 No Channel is selected
0x34 Unknown Command
0x35 Channel Already Open
0x36 Channel Already Closed
0x37 Application Not Open
Table 10 presents the PMR-MUX2 status strings.
Name
ACK Indication
NAK indication
Table 11 lists the PMR-MUX2 error codes.
Description
The OS sends this error when the smart device application attempts to write
to a mux channel that it has not opened.
The OS sends this error when the smart device app specifies a bad channel
number in an open or close command.
The OS sends this error when a command doesn't contain a channel number.
The OS sends this error when a command byte is received that it does not
recognize.
The OS sends this error when the smart device application tries to open a
channel that is already open.
The OS sends this error when the smart device application tries to close a
channel that is already closed.
The OS sends this error when the smart device application tries to open or
write to a channel in which the Verix application has not opened the channel.
Description
This Message Status is a method for either end of the
link to send and ACK status to the other end. This
indicates that the previous message was received
properly. The <num> parameter is an ASCII number
from 2 to 6 to specify the channel number. The <crc>
field is a 16 bit CRC of the complete message including
the 2 byte header and the data field.
This Message Status is a method for either end of the
link to send NAK error codes to the other end in the
event of a message error. The error codes are a single
byte ASCII values. The specific error codes are
described below. The <num> parameter is an ASCII
number from 2 to 6 to specify the channel number. The
<crc> field is a 16 bit CRC of the complete message
including the 2 byte header and the data field.
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