MagTek MT-211232 RS-232 3-TRACK - Manual (Page 23)

Section 3. Operation
17
HOST TO READER COMMANDS
All commands transmitted from the host to the Reader must be preceded by an ASCII “Escape”
<ESC> character. Characters that precede or follow the command sequence will not affect the
Reader’s command interpretation. All ASCII characters must be transmitted in UPPER CASE
(for example, ASCII “I” and “R”).
Buffer Mode Commands
Commands used in the buffer mode are as follows:
Switch 8 Command Description
ON <ESC> “I “ Inquiry Command: In the buffered mode, requests the Reader
to Transmit data, or “E” for error, or “R” for empty buffer. In
the unbuffered mode transmits an ASCII “R”.
ON <ESC> “R” Release Command: In the buffered mode, requests the Reader
to clear the memory buffer of any data present. This command
has no effect in the unbuffered mode.
TIMING
Transmission timing is shown in Figure 3-3. Each ASCII character is transmitted with 1 start
bit, 7 data bits, 1 parity bit, and 1 stop bit. Logic levels conform to standard RS-232 levels; logic
levels are “true” or “1” if the level is low. The levels are quiescently low.
Figure 3-3. Transmission Timing
TOP ASSEMBLY DRAWING
The top assembly drawing is shown in Figure 3-4.