User's Manual

C287 REFERENCE MANUAL
10
3
3 POWER AND ELECTRICAL INTERFACE
3.1 TERMINAL SCREWS
Power and serial communications connections for the C827 are made at terminals screws
located on the interface block of the C827 enclosure. Your cable should be wired to these
terminals according to the pinouts given in Table 3-1 and shown in Figure 3-1.
Table 3-1: C827 terminal connections
C827
Terminal
Description RS232
not isolated
Description RS232
isolated
RS232
Host, DE9
RS232 Host,
DB25
1 Signal GND Signal GND N/C N/C
2 RS232 RX RS232 RX DE9 pin 3 DB25 pin 2
3 VDC VDC N/C N/C
4 RS232 TX RS232 TX DE9 pin 2 DB25 pin 3
5 Signal GND, GND GND DE9 pin 5 DB25 pin 7
NOTE:
Signal names referenced to host com port.
Use shielded cable only. Connect shield drain at one end only, preferably at the host or
power supply end. RS485 requires 120 ohm termination resistors (refer to page 20).
Figure 3-1. C827 terminal screws
NOTE: To fully comply with FCC regulations Part 2, you should attach a ferrite clamp (such a
WURTH 7427144) around the power and communication cables as close to the cord grip as
possible.
CAUTION: Do not bundle communications wiring with high current power lines. This will
cause communications errors.