G100 Instruction Manual
D.20 Communications between the D.20 HDLC PCIe card and the D20 peripheral I/O modules are carried over a
proprietary high-speed, high-level data link control (HDLC) protocol called the D.20 Link.
The D.20 HDLC PCIe card supports two D.20 Link communications ports. The G100 system can be ordered from
the factory with the D.20 HDLC PCIe card pre-installed using the Product configurator through the Online Store
or can be installed infield by ordering the D.20 HDLC PCIe card as an accessory from the MCP Substation
Gateway Spare Parts and following the “Installation of optional D.20 HDLC Card” on page 27.
G100 is limited by performance to communicate with up to 60 D.20 peripheral I/O modules.
Please consider the G500 product for more D20 peripheral I/O modules (up to the maximum of 120).
G100 D.20 HDLC PCIe card
The D.20 HDLC PCIe card is equipped with a Power Pass Through connector, two D.20 ports and four LEDs.
The Power Pass Through connector allows the D.20 peripheral connected to the D.20 Link to be powered
through the D.20 port. The Power Pass Through requires one or two external power supplies to be connected.
Refer to “Supplying power through the D.20 Link” on page 29 section for further details.
Two sets of LEDs are present on the D.20 HDLC PCIe card to indicate activity status. The first set of LEDs, on the
left labeled D.20 1 Act, shows the transmit and receive activity on D.20 Channel 1 and the second set to show
activity on D.20 Channel 2 on the right labeled D.20 2 Act. The receive LEDs will flash red and the transmit LEDs
will flash green.
The D.20 HDLC PCIe card has two D.20 ports. Each port contains D.20 Channel 1, D.20 Channel 2, DC Supply 1,
and DC Supply 2. For D.20 port A, the above signals are always available. For D.20 port B, D.20 Channel 1 and
D.20 Channel 2 are configurable but DC Supply 1 and DC Supply 2 are always available. Refer to Table 1: D.20
Port A and B pin out and configuration options and Table 2: Default D.20 Relay settings. D.20 Port B settings are
software controlled and are accessible through the Settings GUI on your G100. Refer to SWM0101 for further
details on configuration.
Table 8: D.20 Port A and B pin out and configuration options
Pin Number
D.20 port A
D.20 Port B
1
No Connection
No Connection
2
OPEN
3
D.20 Channel 1 TX/RX -
D.20 Channel 2 TX/RX -
OPEN
4
VDC1 +
VDC1 +
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