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- Description
- Specifications
AD281A is a 16-port RS-232 port module with DB-25 male connectors, built to hang off the AD279A PCI MUX 64-port serial adapter. One AD279A takes up to four port modules, and AD281A can sit beside the RJ45 module AD280A on the same adapter, joined by the 16 inch EBI cable that both types share. The module part is AD281-2000A.
Two modules run from bus power; each draws 0.7 A typically. The third and fourth module need the external supply AD280-2001A, which AD281A shares with AD280A. DB-25 pin-outs: transmitted data on pin 2, received data on 3, RTS on 4, CTS on 5, DSR on 6, signal ground on 7, DCD on 8, DTR on 20 and ring indicator on 22, with the chassis ground on the shell.
Cable choices cover a three-wire null-modem cable for XON/XOFF software flow control, a four-wire DTR cable with pins 4 and 5 jumpered, an RTS/CTS cable, a fully wired terminal or printer cable and a DB-25 modem cable. The module measures 30.48 cm by 17.78 cm by 10.668 cm and weighs 1814.40 g. Surge suppression triggers at 13 V in under 10 nS.
The adapter that drives AD281A is supported on the HP 9000 rp3410, rp3440 and HP 9000 rp4440 under HP-UX 11i v1 and v2, and on the rx2620 and rx4640 under 11i v2. Port names on the first module of the first adapter run /dev/tty1a1 to /dev/tty1a16, and modem ports use the ttyd, cul and cua prefixes.
| Designation | AD281A |
| Manufacturer | HPE |
| Type | 16-port RS-232 port module |
| Connector | DB-25 male |
| Ports | 16 |
| Works with | AD279A PCI MUX 64-port adapter |
| Power | from the EBI bus, 0.7 A typical; modules three and four need AD280-2001A |
| Module part | AD281-2000A |
| Size | 30.48 cm x 17.78 cm x 10.668 cm |
| Weight | 1814.40 g |
| Surge suppression | 13 V threshold, under 10 nS |
| Maximum modules per adapter | 4 |