Serial Card, 2 Ports, RS232/RS485

The DeltaV system supports the Serial Card, 2 Ports, RS232/RS485 and the Series 2 Serial Card, 2 Ports, RS232/RS485.

The DeltaV Serial Card provides an interface to a variety of serial devices, such as PLCs (Programmable Logic Controllers) that use the Modbus RTU or ASCII protocol. With the DeltaV Explorer, you can configure each of the two ports provided on the serial card to support RS232, RS422/485 half duplex, or RS422/485 full duplex signals and you can configure the baud rate of each port.

Installation Notes

For CE compliance, use shielded cables to connect the serial card to external devices. Ground the cable shield at one end only. If the external device does not provide a mechanism to ground the cable shield, connect the shield to the DeltaV Carrier Shield Bar. If you use the RS422/485 ports, the shield must also provide the ground reference for the port. Connect the cable shield to the corresponding ground (GND) terminal on the interface terminal block.
The Interface terminal block is recommended to provide screw terminations for field wiring for the Serial card and the Series 2 Serial card in Simplex mode.
The Redundant Interface terminal block is recommended to provide screw terminations for field wiring for the Series 2 Serial card in Redundant mode.
Refer to ANSI TIA/EIA-485-A for RS485 full duplex termination requirements.

The following tables define the terminal assignments for RS232, RS422/485 half duplex, and RS422/485 full duplex port types.

Table: RS232 Terminal Assignments
Terminal	Assignment
Terminal 1	Port 1 GND
Terminal 3	Port 1 TXD
Terminal 5	Port 1 RXD
Terminal 7	Port 1 DTR
Terminal 8	Port 1 DSR
Terminal 9	Port 2 GND
Terminal 11	Port 2 TXD
Terminal 13	Port 2 RXD
Terminal 15	Port 2 DTR
Terminal 16	Port 2 DSR

Table: RS422/485 Half Duplex Terminal Assignments
Terminal	Assignment
Terminal 1	Port 1 GND
Terminal 2	Port 1 DATA+
Terminal 4	Port 1 DATA-
Terminal 9	Port 2 GND
Terminal 10	Port 2 DATA+
Terminal 12	Port 2 DATA-

Note

RS-485 Full Duplex is not supported when the card is configured as a Modbus slave in a multidrop environment.

Table: RS422/485 Full Duplex Terminal Assignments
Terminal	Assignment
Terminal 1	Port 1 GND
Terminal 2	Port 1 TXD+
Terminal 4	Port 1 TXD-
Terminal 6	Port 1 RXD+
Terminal 8	Port 1 RXD-
Terminal 9	Port 2 GND
Terminal 10	Port 2 TXD+
Terminal 12	Port 2 TXD-
Terminal 14	Port 2 RXD+
Terminal 16	Port 2 RXD-

Table: Serial Card, 2 Ports, RS232/RS485 Specifications
Item	Specification
Number of serial ports	Two
Port types	RS232, RS422/485 half duplex, RS422/485 full duplex (configurable with the DeltaV Explorer)
Isolation	Each port is optically isolated from the system and from each other and factory tested to 1500 VDC. The ports must be grounded via the external device.
Baud rate	Configurable with the DeltaV Explorer
Maximum cable lengths	RS232: 15 m (50 ft) RS422/485: 610 m (2000 ft)
LocalBus current (12 VDC nominal), per card	200 mA typical, 300 mA maximum
Field circuit power, per card	None
Mounting	Assigned slot of I/O carrier

Figure: Wiring Example, Interface Terminal Block, Serial Cardshows a wiring scheme from Port 1 on the Interface terminal block for a Serial card and a Series 2 Serial card in Simplex mode to a Modicon Model 984 controller.

Figure: Wiring Example, Interface Terminal Block, Serial Card

The following figure shows an example for connecting a primary and secondary computer to a Redundant Interface terminal block for a Series 2 Serial card in Redundant mode. For each computer, use the same wiring scheme as shown in Figure: Wiring Example, Interface Terminal Block, Serial Card.

Figure: Wiring Example for Redundant Interface Terminal Block