Using A Black Box Converter; Table 2-2 Black Box Converter Wiring Connections Procedure; Wiring The Black Box Converter And The Link - Honeywell UDC2300 Product Manual

2.3

Using a Black Box Converter

Wiring the Black Box
converter and the link
10/00 RS422/485 ASCII Communications Option Product Manual
Figure 2-1 shows the wiring diagram and terminal connections for wiring
the RS232 to RS485 Black Box converter.
Follow the procedure in Table 2-2 to wire the Black Box converter.
Table 2-3 shows the terminal designation for the devices on the link.
Table 2-2 Black Box Converter Wiring Connections Procedure
Step
1 Install an appropriate Serial Communication Connector between the
Computer serial port and the RS232 input connector of the Black Box
converter. See the Black Box data sheet for the required
interfacing signals.
2 Connect one wire to terminal 2 (–).
3 Connect other wire to terminal 1 (+).
4 Connect a 120 ohm resistor across 1 and 2.
5 Set the jumpers on the Black Box converter Printed Circuit Board as
follows:
JUMPER
XW1A
W8
W15
W5
W9
W17
W16
S1
S2
S3
6 Create a chain of up to 31 devices by connecting them with shielded
twisted pair wiring (Belden 9271 Twinax or equivalent) to a maximum
total length of 4000 feet (1250 meters).
(See Section 8—Cable Specifications.)
REFER TO TABLE 2-3 FOR TERMINAL DESIGNATIONS OF THE
DEVICES ON THE LINK
Action
SETTING
DCE
B-C (2-wire)
B-C (Data Enabled)
A-B (RTS/CTS delay - normal)
C (0 msec)
C (2 msec)
B (0.1 msec)
OUT (Normal)
ON (RS485 Receiver Terminated)
ON (Line Bias On)
7