Specifications

Publication GMC-SG001E-EN-P — June 2001
4-28 1394 Drive System Family
System Module Encoder Input Specifications (1394x-SJTxx-C-xx, -L-xx, and -T-xx)
Serial I/O Specifications (1394x-SJTxx-C-xx, -L-xx, and -T-xx)
Specification Description
Number of encoder inputs
• 4 (axis 0, 1, 2, and 3) for 1394x-SJTxx-C-xx and -T-xx systems
• 2 (axis 0 and 1) for 1394C-SJTxx-L-xx systems
Type of encoder input Incremental AB quadrature; optically isolated, differential with marker channel
Encoder interface IC AM26LS32 or equivalent
Compatible encoder types Differential, TTL-level (5V DC) line driver outputs, with or without marker
Decode modes 4 times quadrature, step/direction, count up/count down
Maximum encoder frequency
4,000,000 counts per second (4 MHz). This is equivalent to a channel frequency of 1
MHz in 4x quadrature decode mode.
Input impedance 7 kohms minimum (each input)
Encoder power 5V DC @ 1A, user supplied
Specification Description
Number of serial channels 2 (serial port A and serial port B)
Channel type Optically isolated RS-232 or RS-422; each channel individually configured via internal switch
Information code ASCII
Baud rate User-selectable up to 128 kbaud (rs-422); 115.2 kbaud (RS-232)
Number of start bits One
Number of stop bits One
Word length 8 bits (7 data bits plus 1 parity bit)
Parity Space parity transmitted; receive parity ignored (may be mark, space, even, or odd)
Duplex Full or half (user-selectable)
Data synchronization XON (control-q)/XOFF (control-s)
Front panel connectors IBM-PC/AT compatible 9-pin D-type female
RS-422 termination User-selectable 220 ohm resistor via internal switch