Manual

Introduction 2-9
Publication 999-122 - January 1997
Serial I/O Specifications
DH-485 Specifications
Number of
Serial Channels 2 (Serial Port A and Serial Port B).
Channel Type Optically isolated RS-232C or RS-422; each channel individually
configurable via internal switch.
Information Code ASCII (American Standard Code for Information Interchange).
Baud Rate User-selectable up to 128k Baud (RS-422).
User-selectable up to 115.2k Baud (RS-232C).
Number of
Start Bits 1.
Number of
Stop Bits 1.
Word Length 8 bits total; 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 220Ω resistor via internal switch.
Number of
DH-485 Channels 1; replaces Serial port B when used.
Channel Type Optically isolated half-duplex RS-485.
Baud Rate 9,600 or 19.2k Baud (user-selectable).
Front-Panel
Connectors Two RJ-45 jacks (+24V is not provided).
RS-485
Termination User-selectable 220Ω resistor via internal switch.
Node Address User-selectable between 0 and 31 inclusive.
Node Type Token-passing master.
Accessible Data
Files
1 Binary file (B3) for up to 16,384 bits
1 Integer file (N7) for up to 1,024 16-bit values
1 Floating-point file (F8) for up to 512 32-bit values
1 ASCII string file (A) for up to 2,048 characters
9 user-configurable files; each can be individually configured as any of
the above types or as a BCD file for floating point simulation (required
for certain A-B MMI devices).