PAGE 11 01 SEPTEMBER 1998 CHAPTER 2: INSTALLATIONS
HE500OCS050/051 User Manual
a.
RS-232 Communications Wiring
The OCS units feature an RS-232 port for connection to a personal computer (for programming the OCS).
The wiring diagram for the RS-232 ports is shown below. If a permanent connection is to be made
between the OCS and the personal computer, Horner Electric recommends using a shielded, multiple pair
wire with a maximum length of 15 meters to ensure maximum performance.
2.1.5
8 Positive (or Negative) to Isolated Common Inputs (Input Port)
Table 2.4 - Input Port
Rated Voltage
±
24VDC
Input Voltage Range
–30 to +30VDC
Input Characteristics
On-state Voltage
±
15 to
±
30VDC
Off-state Voltage
–6 to +6VDC
On-state Current
±
4.5mA minimum
Off-state Current
±
2.0mA maximum
On response Time
2ms maximum
Off response Time
2ms maximum
Pin 9
Pin 1
9-PIN PC COM
OCS RS-232
Figure 2.8 - OCS to PC Wiring Diagram
Figure 2.7 – RS-232 Port
