Serial card specifications

Installation notes

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 configure the baud rate of each port.
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's 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 terminations for field wiring for the Serial card.
The Redundant Interface terminal block is recommended to provide terminations for field wiring for the redundant Serial card.
Refer to ANSI TIA/EIA-485-A for RS485 full duplex termination requirements.
This card requires an S-series controller.

Specifications

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 specifications
Item	Specification
Number of serial ports	Two
Port types	RS232, RS422/485 half duplex, RS422/485 full duplex (configurable with the DeltaV Explorer)
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	Simplex and redundant: 200 mA typical 300 mA maximum
Field circuit power, per card	None
Heat dissipation	3.6 simplex and redundant
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.
Mounting	Assigned slot of I/O carrier

Wiring examples

The following figure shows example wiring from port 1 on the Interface terminal block, for a simplex Serial card, to a Modicon Model 984 controller.

Figure: Interface terminal block and simplex Serial card wiring example

The following figure shows example wiring for connecting a primary and secondary computer to a Redundant Interface terminal block for a redundant Serial card. For each computer, use the same wiring scheme as shown in the previous figure.

Figure: Redundant Interface terminal block and redundant Serial card wiring example