CyberResearch COMHP 101, Руководство пользователя

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CyberResearch
®
Serial Communication COMHP 101
CyberResearch, Inc . 5
25 Business Park Drive P: (203) 483-8815; F: (203) 483-9024
Branford, CT USA www.cyberresearch.com
Interface Selection
The COMHP 101 supports a variety of electrical interfaces. Reference the Control and Status Register
Definitions , found in the Technical Description section of this manual for this bit description. There is line
termination on RXD, RXC, and TXC in the following modes: RS-530, RS-530A, RS-485T, and V.35.
HEX M3 M2 M1 M0 INTERFACE MODE
0 0 0 0 0 all signals are high impedance
1 0 0 0 1 * not supported *
2 0 0 1 0 RS-232
3 0 0 1 1 * not supported *
4 0 1 0 0 RS-485T with 120 ohm termination
5 0 1 0 1 RS-485 without termination
6,7,8,9 0 1 1 0 * not supported *
A 1 0 1 0 single ended loop-back
B 1 0 1 1 differential loop-back
C 1 1 0 0 * not supported *
D 1 1 0 1 RS-530
E 1 1 1 0 V.35
F 1 1 1 1 RS-530A
Reset Circuit
The 16C32 can be reset by writing any value to base+3. There is a capacitor that is discharged each time you write
to base+3. It requires multiple writes to get a reset. When you read base+3 bit D4 and it is 0, that means you have
written it enough times. After base+3 bit D4 goes to 0, then you must continue to read it until it goes back to 1.
TSET Clock Select
Port5 of 16C32 is used to select TSET clock source.
0 selects 16C32 TXC as source
1 selects received TXC as source
16C32 Register Access
Pin Source
Port0 20 Mhz clock
D/C ( data/control ) address SA6
S/D ( serial/DMA ) address SA7
DMA channel registers base + 0-127
Serial controller base + 128-255