Chapter 5: Serial ports
Description
The 2060 CPU Card has two serial ports, COM1 and COM2, which are accessed
through the multipurpose connector, J2. These serial ports interface to a printer,
terminal, or other serial device. Both ports support 5-, 6-, 7-, or 8-bit word lengths,
1, 1.5, or 2 stop bits, and baud rates up to 115.2K.
The serial ports have the following specifications:
16550 compatible
16-byte FIFO buffers
IEC 1000, level 3, ESD protection
— Contact discharge ±6 kV
— Air–gap discharge ±8 kV
Backdrive protection
Up to 115.2k baud operation
Mating receptacle
Use a 2060 HDC-18-SBC-Multiport cable to connect the COM ports to external
serial equipment. The two COM connectors of the 2060 HDC-18-SBC-Multiport
cable are DB-9 female connectors that plug directly into a 9-pin PC serial cable. See
pages 26 and 27 for information on the 2060 HDC-18-SBC-Multiport cable. Use a
2060 RS–422/485 cable for connecting RS–422 and RS–485 devices, through the J7
connector.
Figure 5–1 (following page) shows two serial devices connected to the 2060 CPU
Card. It also shows the schematic for connecting RS–422 and RS–485 devices. Note
that you cannot use COM2 for RS–232 and RS–422/485 at the same time.
Serial port configurations
COM1 and COM2 are 8-wire RS–232 interfaces. COM2 can also be configured in
BIOS Setup for 4-wire RS–422/RS–485 interfaces. RS–422 and RS–485 use the J7
connector. Some configurations of RS–422/RS–485 also require jumpers.
The COM ports are defined in table 5–1. Tables 5–2 and 5–3 show the COM pin-
outs for the two COM ports as well as the pin-out for the RS–422/485 cable, and
table 5–4 shows the jumper settings.
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