GTCO MM II 1201 - Users Guide - Manual (Page 12)

MM II 12
TTL Interface
The computer port must provide full duplex, asynchronous, serial communications. The
signal levels for data transmission are:
TTL Signal Levels
TTL Interface Interchange Voltage
0V to 0.8V +2.4V to +5V
Binary states
Signal condition 1
Mark 0
Space
Section B: Baud Rate
The MM II is available with 9600 baud or Autobaud. The standard setting is 9600 baud,
unless Autobaud is specifically ordered.
Autobaud automatically matches the tablet baud rate to the host baud rate. The tablet
supports 75 to 19,200 baud. After turning on the tablet, the first character it must receive
from the host is an ASCII space, . The tablet uses this to identify the host baud rate
and to set its own accordingly.
Section C: Communication Protocols
The MM II communication protocols are:
 Number of start bits: 1
 Number of data bits: 8
 Number of stop bits: 1
 Parity: odd or none. (The standard product has odd parity.) To change the parity
setting, refer to Changing the Tablet Setup in Chapter 1.
Section D: Report Formats
The MM II has one of the following report formats:
 Binary
 ASCII BCD
To change the format, refer to Changing the Tablet Setup in Chapter 1. The reports are in
counts of resolution and not in inches or millimeters.