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Documentation Number 3PCISD4x-3903 Manual Chapter 1 3
B&B Electronics Mfg Co – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104
B&B Electronics Ltd – Westlink Comm. Pk. – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445
RS-422/485 Driver/Receiver:
Device: 75ALS180 or MAX491
Differential driver output voltage: 1.5 - 6 V
Differential input high-threshold voltage: 0.2 V
Differential input low-threshold voltage: −0.2 V
Automatic RS-485 Driver Control Timing:
Driver is enabled when data is a logic “0” (start bit). Driver
remains enabled for one character transmission time (10 bits
of data at current baud rate). Each additional logic “0” resets
the timeout.
Termination: A 120Ω termination resistor is jumper selectable on
each 422/485 receiver.
Max Power Consumption: All ports loaded
+5V, 437 mA, 2.18W
+12V, 124 mA, 1.49W
-12V, 124 mA, 1.491W
Accessories:
Cable: One DB-37 Male to four DB-9 Male (included)
Replacement cable model number: 37M9M
Software: Driver Disk (3.5) for Windows 95/98/2000/NT 4.0
PCI/USB COM Port Utility Disk (3.5)
Manual: Instruction Manual (this booklet)
4 Chapter 1 Documentation Number 3PCISD4x-3903 Manual
B&B Electronics Mfg Co – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104
B&B Electronics Ltd – Westlink Comm. Pk. – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445