Sharp MZ-5600 Service Manual page 50

Channel A is synchronous, and may be used for BSC
protocol.
*
Binary synchronous communication (BSC):
The BSC is a character-type communication protocol, in
which a series of standard control characters are used for
synchronous binary data transmission between offices
for data communications.
Pin No.
Mnemonics
Signal name
1\"
Signal direction
1
SG Signal ground
(FG)
(Fram ground)
2 SO Send data OUT
3 RD Receive data IN
4 RS Request to Send OUT
5 CS
Clear to send
IN
6 READY
Data Terminal Ready OUT
(DTR)
7
SG Signa! Ground
8
OR
Dat;set Ready
IN
(DSR)
9
SG
Signal Ground
IN
12 ER
Equipment Ready OUT
!
12·3 Serial interface signal lines
Channel A: Usable for both asynchronous and synchronous
(BSC) communications.
Note: When interfacing one device to another via the
RS-232C interface, the transmission rate, word
length, parity bit, and stop bit on each device must
first be set up identically. The signal lines to be used
will differ depending on individual devices. There-
fore, the user must have a full understanding of
the signal lines and their functions used for the
interface.
Input/output signal pin functions
Table 29
Description
*1
Data sent by the MZ-5500
Data received by the MZ-5500
In CP/M-86 or BOOS: Always off.
,In BASIC: On during data send
-
Turned off at the end of data send.
Response to Request to Send:
If this signal is on, the system sends data. If it is off, the system
stops data send.
Note: Up to two bytes of data may be sent after the CS is
turned off.
Indicates whether or not the system is ready for data reception:
READY is on if the system is ready.
READY is off if the system is not ready.
*1
I ndicates whether or not the remote device is ready for operation.
On if the remote device is ready for data send/receive.
Off if the remote device is not ready for data send/receive.
If this signal is turned off during data send/receive operation,
an error will result.
*2
*1
Always on as long as the system power is on.
While the MZ-5600 system has the following additional signal lines, they are not supported in the CP/M-B6FDOS or BASIC (only channel A).
10 CD
Carrier Detect IN I ndicates the remote device is a sending carrier.
11
Cl Call Indication
IN
Indicates a termination call has arrived from the line.
13 STl Transmitter Signal element,
OUT
Outputs a send Signal element timing information for synchronous
timing
communications. (DTE source)
14
RT
Receiver Signal element timing IN
Inputs receiver signal element timing for synchronous communi-
cations. (DCE source)
15 ST2
Transmitter signal element
IN
Outputs (from device) send Signal element timing for synchronous
timing
communications. (DCE source)
*1. Pins 1, 7, and 9 are signal grounds.
*2. The CS and OR pin functions may be disabled. For more details see the description of the RSPARM and 10CNF in the CP/M-B6
User's Manual.
*3. For the details of the CD, Cl, ST1, RT, and ST2, see the Owner's Manual.
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