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76 Register Programming Information
Set BLOCK Size Command, xx 29
This command sets the BLOCK size. The PARM0 and PARM1 registers are
both 16 bit registers. The lower 12 bits of each register express the BLOCK
length from 1 to 2048 bytes. Block Size should have a value greater than 1.
The upper four bits are not used. To read the current BLOCK size, use the
Query BLOCK Size Command (09
Set Parameters PARM0: BLOCK low code;PARM1: BLOCK high code.
Default/Reset Value: PARM0: 00
Set Port Mode Command, xx 2A
This command sets the port mode. To read the current Port mode, use the
Query Port Mode Command (0A
Set Parameters:
PARM0: Port Mode code; PARM1: watchdog timer
Default/Reset Value: PARM0: 00
Code
Port Mode
00
h
01
Auto-Echo
h
Where:
Normal
In this mode, the HP E2261A has the transmitter and
receiver operating independently.
Auto-Echo
This mode sets the port to retransmit data
automatically. The following conditions are true:
1. Received data is clocked and retransmitted on the TX
output.
2. Receiver clock is used for the transmitter.
3. Receiver must be enabled, but the transmitter does
not need to be enabled.
4. Received parity is checked but not regenerated for
transmission.
Local Loop
In this diagnostic mode, the following are true:
1. The transmitter output is internally connected to the
receiver input.
2. The transmitter clock is used for the receiver.
3. The TxD output is held high.
4. The RxD input is ignored.
5. Both transmitter and receiver must be enabled.
6. The host computer to the HP E2261A continues
normally.
h
).
h
PARM1: 08
h
h
).
h
PARM1: 01
h
Code
Normal
02
h
03
h
(2kBytes)
h
0 = off, 1 = on.
h
Port Mode
Local Loop
Remote Loop
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