The RS-232 standard uses single ended signals on a DB-25 connector. The adapter DB-25 connector follows this standard when the port jumpers are installed for RS-232. Use any straight through 25 conductor DB-25M to DB-25F cable (such as MicroGate Part # CMF000) to connect the adapter connector to the communications equipment. The maximum data rate supported by the adapter when using RS-232 is 128Kbps. Cable length and signal loading may reduce the maximum usable data rate from this value.
The V.35 standard uses a mix of single ended and differential signals on a 34 pin block connector. To use this standard, install the V.35 jumpers on the port and use the MicroGate V.35 cable (Part # 2534GT, picture shown below). Note that the LL, RL, and RI signals are available on the adapter’s DB-25 connector when the V.35 jumpers are installed, but are not available (NC = no connect) on the 34 pin block connector when using the V.35 cable. The maximum data rate supported by the adapter when using V.35 is 10Mbps. Cable length and signal loading may reduce the maximum usable data rate from this value.
The RS‐422 and RS‐485 standards describe differential electrical signals but not connector or pin assignments. The RS‐530 and RS‐449 standards define specific connectors and pin assignments using differential signals. The differential signals on the card meet both RS‐422 and RS‐485 electrical specifications.
RS‐530 uses differential signals on a DB‐25 connector. The adapter DB‐25 connector follows this standard when the port jumpers are installed for RS‐422/485. Use any straight through 25 conductor DB‐25M to DB‐25F cable (such as MicroGate Part # CMF000) to connect the adapter to RS‐530 communications equipment.
RS‐449 uses differential signals on a DB‐37 connector. To use this standard install the RS‐422/485 jumpers for the port and use the MicroGate RS‐449 cable (Part # 2537FM).
The maximum data rate supported by the adapter when using RS‐530 or RS‐449 is 10Mbps. Cable length and signal loading may reduce the maximum usable data rate from this value.
X.21 is an interface standard using differential signals on a DB‐15 connector. To use this standard, install the RS‐422/485 jumpers on a port and use the MicroGate X.21 cable (Part # 2515FM).
The X.21 signal names are different than those used by the adapter and other interface standards. The mapping of the X.21 signals to the adapter signals are shown in the table below.
The maximum data rate supported by the adapter when using X.21 is 10Mbps. Cable length and signal loading may reduce the maximum usable data rate from this value.
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Established in 1982, MicroGate is an Austin, Texas based company that designs, manufactures and markets a complete line of specialized communications solutions for PC workstations, servers, laptops and embedded environments.
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