SIO-2 (98) (CONTEC)

Serial I / O (RS-232C) module.The transfer rate is 75 to 9600 baud.
Input / output port 2 channels (the second channel is TTL level and current loop
(Option: SIO-2C (98), possible to 2400 baud: TXD, RXD only)
It can be selected by jumper).8251 datasheet to use this board
Or materials equivalent to that are essential.

Two 8-deep dip switches and two 4-deep dip switches on the board,
One 2x4 jumper switch, 2x8 series jumper switch 2x, 3x4 series
1 jumper switch, 3 x 6 series dip switches 1x, 3 jumpers
There is one switch.

Transfer method: asynchronous serial transfer, half duplex, full duplex
Number of equipped channels: 2 channels
Transfer rate: 75-9600 baud
Input / output specification: CH1 RS232C
　　　　　　CH2 RS232C, TTL or current loop (TXD, RXD only)
Occupied port: 8 bits 8 ports
Connector: EIA standard connector (cable should be used within 15m)
LSI used: 8251 equivalent
Power consumption: DC + 5 V, 600 mA
Operating environment: 0 to 50 °, humidity 20 to 90% (without condensation)

・ 8-station dip switches SW1 and SW2: I / O port address setting
　Same as other CONTEC control and measurement boards (PIO-48W (98) etc .: SW2
  6-7-8 is invalid.ON, OFF may be either)
　Example) F0D0h
　　　SW1 = ON-ON-ON-ON-OFF-OFF-OFF-OFF
　　　SW2 = ON-ON-OFF-ON-OFF-OFF-OFF-OFF

Port address and I / O map
■ Input side
　Set port address + RX data of CH1
　　　　　　　　　　　　+1 ■ unused
　　　　　　　　　　　　Status data of +2 CH1
　　　　　　　　　　　　+ 3 ■ unused
　　　　　　　　　　　　RX data of +4 CH2
　　　　　　　　　　　　+ 5 ■ unused
　　　　　　　　　　　　Status data of +6 CH2
　　　　　　　　　　　　+7 ■ unused
■ Output side
　Set port address + TX data of CH1
　　　　　　　　　　　　+1 ■ unused
　　　　　　　　　　　　+2 CH1 mode / command
　　　　　　　　　　　　+ 3 • bit 7 = CH1 reset
　　　　　　　　　　　　TX data of +4 CH2
　　　　　　　　　　　　+ 5 ■ unused
　　　　　　　　　　　　+6 ■ CH2 mode / command
　　　　　　　　　　　　+7 bit 7 = CH2 reset

・ 2 x 8 jumper switches: Transfer rate setting.JP4 is CH1 and JP5 is CH2
　Each corresponds.
　Baud rate that can be set with silk print numbers at the bottom of JP4.In this case baud
　The rate reference clock is limited to 16 times.At the time of mode set
  Attention.

・ 2x4 jumper switch JP1, 3x6 jumper switch JP3,
　Quadruple dip switch SW4: CH2 RS232C / TTL level / current loop switching
(1) RS232C
   JP1: All open
   JP3: All AC short circuit
   SW4: OFF-OFF-ON-OFF
(2) TTL level
   JP1: All open
   JP3: All short between BC
   SW4: All off
(3) Current loop (option, external power supply is also required)
   JP1: All short
   JP3: 1, 4 open, 2, 3, 5, 6 short between BC
　   Check the values of internal resistances RA and RB of the TXD and RXD terminals on the other side, and
     Make the current to be 20mA:
     　(External power supply voltage) / (R1 (620 Ω) + RA) = 20 mA
　     (External power supply voltage) / (R6 (620 Ω) + RB) = 20 mA
   SW4: With current (20 mA) and without current (0 mA) on the externally connected loop
        Setting of internal logic of.
　　 Below, Current 1 SW4 1 (RXD) OFF 1 SW 2 4 (TXD) OFF 4 Same ON order.
     Both 3 and 4 are OFF.
     No current ■ L ■ H ■ H ■ L
     Current 20 mA H L L H

・ 3x4 jumper switch JP2, 2 dip switch SW3: Interrupt setting
　When using the interrupt signal generated from 8251, set the interrupt level in JP2
　Select and use SW3 to select which interrupt RXRDY or TXRDY to use.C of JP2
　Connected to the interrupt signal line: C1 = INT 0, C2 = INT4, C3 = INT5
　C4 = INT 6.
　JP2's A is CH1, B is CH2.
　1 of SW3 is CH2 TXRDY, CH2 RXRDY, CH1 TXRDY, CH1 RXRDY.
　Factory setting: SW3: All on; JP2: 1, 2 = open, 3 = AC short,
　4 = short between BC.In this case, RXRDY and TXRDY of CH1 and RXRDY of INT5 and CH2 are
　TXRDY is input to INT 6.
　If you do not use interrupts, make all JP2 open.

・ Three jumper switch JP6: BASIC / Assembler program
Short between 1-2.

Connector pin assignment
When viewed from the back of the board, the pins in the upper row of the connector,
From the left 13-12-11 ..... 3-2-1, the lower row of pins 25-24-23 ..... 16-15-14
If you see,
CH1
　 1 ■ FG ■ frame ground
　 2 TXD RS 232 C
　 3 ■ RXD ■ RS232C
　 4 ■ RTS ■ RS232C
　 5 CTS RS232C
　 6 DSR RS 232 C
　 7 ■ SG ■ signal common
  20 ■ DTR ■ RS232C
CH2
　 1 ■ FG ■ frame ground
　 2 TXD RS 232 C, TTL
　 3 ■ RXD ■ RS232C, TTL
　 4 RTS RS232C, TTL
　 5 CTS RS232C, TTL
　 6 DSR RS 232 C, TTL
　 7 ■ SG ■ signal common
　17 ■ TXD-■ Current loop (-)
　18 ■ TXD + ■ current loop (+)
　20 DTR RS232C, TTL
　24 ■ RXD-■ Current loop (-)
　25 ■ RXD + ■ current loop (+)