Specifications
Publication 1747-SG001E-EN-E - February 2013
64 Select Network Communications
Remote I/O Device Specifications
Serial Network
The SLC 5/03, SLC 5/04, and SLC 5/05 processors have a serial port which is
configurable for RS-232 compatible serial communication. Use the serial port to connect
to devices that:
• communicate using DF1 protocol, such as modems, communication modules,
programming workstations, or other Encompass partner devices.
• communicate using DH-485 protocol.
• send and receive ASCII characters, such as ASCII terminals, bar code readers, and
printers.
When configured for system mode, the serial port supports DF1 protocol. Use system
mode to communicate with other devices on the serial link. You can select the following
DF1 modes:
• DF1 full-duplex: provides communication between an SLC 500 controller and
other
• DF1 compatible devices. In point-to-point mode, the SLC 500 controller uses
DF1 full-duplex protocol.
• DF1 half-duplex master: polls and transmits messages between the master and
each remote node. In master mode, the SLC 500 controller uses DF1 half-duplex
polled protocol.
• DF1 half-duplex slave: uses the controller as a slave station in a master/slave serial
network. In slave mode, the SLC 500 controller uses DF1 half-duplex protocol.
DF1 radio modem: a hybrid between DF1 full-duplex and DF1 half-duplex, this
protocol is optimized for use with radio modem networks.
Remote I/O Device Catalog Numbers and Specifications
Catalog Number Description Backplane Current (mA) @ 5V
1747-SN Remote I/O Scanner Module 600 mA
1747-BSN Backup Scanner Module 800 mA
1747-ASB Remote I/O Adapter 375 mA
1747-DCM Direct Communication Module 360 mA
Remote I/O Device Catalog Numbers and Specifications
Baud Rate Maximum Cable
Distance
Terminating
Resistor Size
Using Extended Node Capability 57.6 K baud 3048 m (10,000 ft) 82Ω 1/2 W
115.2 K baud 1524 m (5000 ft) 82Ω 1/2 W
230.4 K baud 762 m (2500 ft) 82Ω 1/2 W
Not Using Extended Node
Capability
57.6 K baud 3048 m (10,000 ft) 150Ω 1/2 W
115.2 K baud 1524 m (5000 ft) 150Ω 1/2 W
230.4 K baud 762 m (2500 ft) 82Ω 1/2 W