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User Manual
GFK-1503F
Power Supply
Input Dips, Variations
2.4
Serial Ports
The two serial ports are software-configurable for SNP slave or RTU master or slave
operation. 4-wire and 2-wire RTU are supported. If a port is being used for RTU, it
automatically switches to SNP slave mode if necessary. Both ports default to SNP slave and
both automatically revert to SNP slave when the CPU is in Stop mode, if configured for Serial
I/O. Either port can be software-configured to set up communications between the CPU and
various serial devices. An external device can obtain power from Port 2 if it requires 100mA
or less at 5VDC.
Port 1: is an RS-232 port with a 9-pin female D-sub connector. The pinout of Port 1 allows a simple
straight- through cable to connect with a standard AT-style RS-232 port. Maximum cable lengths
from the CPU to the last device attached to the cable are:
Baud Rate
19.2 K and below
38.4K
57.6K
115.2K
Port 2: is an RS-485 port with a 15-pin female D-sub RS-232 adapter (IC690ACC901). Maximum
cable lengths from the CPU to the last device attached to the cable is Port 2 1200 meters (4000
ft.).
Figure 11
CPU Module Datasheets: CPU001, CPU002, CPU005
EN 61000-4-11
During Operation: Dips to 30% and
100%, Variation for AC +/-10%,
Variation for DC +/-20%
Maximum Cable Length
15 meters (50 ft.)
7.5 meters (25 ft.)
5 meters (16 ft.)
2.5 meters (8 ft.)
Chapter 2
Jan 2020
17
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